Paris(CNN) Witnesses have reported gunfire amid a police raid in the northern Paris suburb of Saint-Denis as authorities hunt for two suspects from Friday's deadly terrorist attacks who are believed to be at large.
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Police blocked off roads early Wednesday in Saint-Denis, which is home to the Stade de France sports stadium where three suicide bombings took place Friday.
CNN affiliate BFMTV reported that police officers have been wounded by gunfire during a raid seeking one of the suspects in the wave of violence across Paris, which killed at least 129 people and wounded hundreds more.
French police wouldn't comment on whether any officers had been shot in the Saint-Denis operation.
BFMTV reported that the police raid was linked to the hunt for the so-called "ninth suspect," who may appear in a video recorded by a witness to the attacks.
Police have been analyzing the video, which shows two gunmen inside a black car linked to the attacks and perhaps a third individual driving the car, French media reported.
Seven of the attackers were killed during the wave of violence Friday night, and an international arrest warrant is already out for one suspect, Salah Abdeslam, a 26-year-old Frenchman. The identity of the possible ninth suspect is unknown.
Paris attacks: What you need to know
Brother urges suspect to surrender
Abdeslam's older brother has urged the suspect, who was last seen driving toward the Belgian border hours after the attacks, to turn himself over to authorities.
"I would tell him to surrender. That's the best solution," Mohamed Abdeslam told CNN's Erin Burnett on Tuesday. "But of course, if he has something to do with it, he must accept responsibility."
Paris attack suspects: What we know
Who were suspects in Paris terror attacks?
In their push to unravel the attack plot and the suspected network behind it, counterterrorism and intelligence officials say investigators have uncovered a clue that could be a big break: cell phones believed to belong to the attackers.
According to the officials, one of the phones contained a message, sent sometime before the attacks began, to the effect of: OK, we're ready.
"It points to a sort of organization," CNN terrorism analyst Paul Cruickshank said, "an attempt to try to synchronize what was going down."
But cracking into their communication won't be easy.
Investigators have found encrypted apps on the phones, which appear to have left no trace of messages or any indication of who would have been receiving them, according to officials briefed on the French investigation.
'These are not regular people'
Mohamed Abdeslam said the last time he saw his brothers was about a week ago.
"They left without saying goodbye," he said.
Now one of them is a wanted fugitive. And authorities say another Abdeslam brother, Ibrahim, 31, was among the seven terrorists who either killed themselves or were killed by police in a series of coordinated attacks across the French capital on Friday night that killed at least 129 people and wounded hundreds more.
Night of terror: Paris attacks
A forensic scientist works near a Paris cafe on Saturday, November 14, following a series of coordinated attacks in Paris the night before that killed scores of people. ISIS has claimed responsibility.
Police are out in force November 14 near La Belle Equipe, one of the sites of the terror attacks.
Forensic police search for evidence inside the Comptoir Voltaire cafe after the attacks.
Shoes and a bloody shirt lie outside the Bataclan concert hall on November 14. Most of the fatalities occurred at the Bataclan in central Paris.
Security forces evacuate people on Rue Oberkampf near the Bataclan concert hall early on November 14.
Medics evacuate an injured woman on Boulevard des Filles du Calvaire near the Bataclan early on November 14.
Police, firefighters and rescue workers secure the area near the Bataclan concert hall on November 14.
A man with blood on his shirt talks on the phone on November 14. He is next to the Bataclan theater, where gunmen shot concertgoers and held hostages until police raided the building.
Police officers patrol the area around Notre Dame cathedral in Paris on November 14.
Police officers patrol Paris' Saint-German neighborhood on November 14.
Victims of the shooting at the Bataclan concert venue in central Paris are evacuated to receive medical treatment on November 14.
A woman is evacuated from the Bataclan theater early on November 14.
Forensics are working in the street of Paris after the terrorist attack on Friday, November 13. The words "horror," "massacre" and "war" peppered the front pages of the country's newspapers, conveying the shell-shocked mood.
Rescuers evacuate an injured person near the Stade de France, one of several sites of attacks November 13 in Paris. Thousands of fans were watching a soccer match between France and Germany when the attacks occurred.
A survivor of the terrorist attack in the Bataclan is assisted following terror attacks, November 13. The violence at the Bataclan, which involved a hostage-taking, resulted in the highest number of casualties of all the attacks.
Spectators invade the pitch of the Stade de France stadium after the international friendly soccer match between France and Germany in Saint-Denis.
Spectators embrace each other as they stand on the playing field of the Stade de France stadium at the end of a soccer match between France and Germany in Saint-Denis, outside Paris, on November 13.
A body, covered by a sheet, is seen on the sidewalk outside the Bataclan theater.
Rescuers evacuate an injured person on Boulevard des Filles du Calvaire, close to the Bataclan concert hall in central Paris.
Wounded people are evacuated outside the scene of a hostage situation at the Bataclan theater in Paris on November 13.
A medic tends to a wounded man following the attacks near the Boulevard des Filles du Calvaire.
A woman walks past police and firefighters in the Oberkampf area of Paris.
A riot police officer stands by an ambulance near the Bataclan concert hall in central Paris.
Wounded people are evacuated outside the Bataclan concert hall.
Police secure the Stade de France in Saint-Denis, north of Paris, following explosions during the soccer match between France and Germany.
A wounded man is evacuated from the Stade de France in Saint-Denis, outside Paris.
Spectators gather on the field of the Stade de France after the attacks. Explosions were heard during the soccer match between France and Germany.
French security forces rush in as people are evacuated in the area of Rue Bichat in the 10th District of Paris.
People leave the Stade de France after explosions were heard near the stadium during a soccer match between France and Germany on Friday. Paris Deputy Mayor Patrick Klugman told CNN President Francois Hollande was at the match and was evacuated at halftime.
Victims lay on the pavement outside a Paris restaurant.
Rescue workers and medics tend to victims at the scene of one of the shootings, a restaurant in the 10th District. Attackers reportedly used AK-47 automatic weapons in separate attacks across Paris, and there were explosions at the Stade de France.
French security forces move people in the area of Rue Bichat in the 10th District. A witness told BFMTV that firefighters were on the scene to treat the injured.
Mohamed Abdeslam told CNN that before the attacks, he'd noticed his brothers changing and adopting more radical views. He suspects the Internet could have played a role. But he said his family was shocked by the attack, and had no idea what they were planning.
"My brother who participated in this terrorist act must have been psychologically ready to commit such an act. These are not regular people," he said. "You cannot have the slightest doubt that they have been prepared, that they must not leave any trace which would cause suspicion that they might do such things. And even if you saw them every day, their behavior was quite normal."
Complete coverage of Paris attacks
Suspects questioned by Belgian authorities in February
Police stopped Salah Abdeslam hours after the attacks in a car on his way toward the Belgian border. They let him go because he apparently hadn't yet been linked to the terrorist operation.
Both he and Ibrahim were previously known to authorities: Belgian prosecutor Eric Van Der Sypt told CNN's Ivan Watson that police questioned the Abdeslam brothers in February.
"Ibrahim tried to go to Syria and was sent back by the Turks in the beginning of 2015," Van Der Sypt said. "It was after that that we questioned him."
Both brothers were released, the federal prosecutor said, after they denied wanting to go to Syria.
He said Belgian authorities were also trying to keep an eye on Bilal Hadfi, one of the suicide bombers who struck outside the Stade de France, according to several sources. "We knew (Hadfi) was in Syria," Van Der Sypt said. "But what we didn't know is apparently he was back, as he blew himself up in Paris. But we had no knowledge of the fact that he was back in Europe."
Paris victims from all walks of life
'At war' and launching airstrikes
Declaring the country is "at war," French President Francois Hollande has proposed extending the state of emergency for a further three months, along with sweeping new anti-terrorism laws.
Security forces conducted more than 128 new raids around the country overnight, Interior Minister Bernard Cazeneuve said Tuesday during a radio interview.
Parisians respond to tragedy with silent respect and defiance
Meanwhile, outside the country, French warplanes have launched wave after wave of airstrikes on ISIS' de facto capital of Raqqa in northern Syria, and a major Belgian police operation was conducted Monday in the Abdeslams' home base in Molenbeek, a Brussels suburb with a history of links to Islamist terror plots.
Belgian authorities say two men detained over the weekend in Molenbeek in connection with the attacks are now under arrest for "attempted terrorism and participation in the activities of a terrorist group."
Tracking the suspected mastermind
Before the Paris attacks, France and its allies had tried to target a prominent ISIS member who is believed to have planned the assault on the French capital, a French source close to the investigation said.
World reacts to Paris attacks
President Barack Obama, French President Francois Hollande, second from right, and Paris Mayor Anne Hidalgo arrive at the Bataclan, site of one of the Paris terrorists attacks, to pay their respects to the victims after Obama arrived in town for the COP21 climate change conference early on Monday, November 30, in Paris.
The Eiffel Tower in Paris is illuminated in the French national colors on Monday, November 16. Displays of support for the French people were evident at landmarks around the globe after the deadly terrorist attacks in Paris on Friday, November 13.
People hold hands as they observe a minute of silence in Lyon, France, on November 16, three days after the Paris attacks. A minute of silence was observed throughout the country in memory of the victims of the country's deadliest violence since World War II.
French President Francois Hollande, center, flanked by French Prime Minister Manuel Valls, right, and French Education Minister Najat Vallaud-Belkacem, center left, stands among students during a minute of silence in the courtyard of the Sorbonne University in Paris on November 16.
A large crowd gathers to lay flowers and candles in front of the Carillon restaurant in Paris on Sunday, November 15.
A man sits next to candles lit as homage to the victims of the deadly attacks in Paris at a square in Rio de Janeiro on November 15.
People light candles in tribute to the Paris victims on November 15 in Budapest, Hungary.
People gather outside Notre Dame Cathedral in Paris on November 15 for a national service for the victims of the city's terror attacks.
People write messages on the ground at Place de la Republique in Paris on November 15.
People pray during a candlelight vigil for victims of the Paris attacks at a church in Islamabad, Pakistan, on November 15.
French golfer Gregory Bourdy passes a peace symbol for the Paris victims during the BMW Shanghai Masters tournament November 15 in Shanghai, China.
A man offers a prayer in memory of victims of the Paris attacks at the French Embassy in Tokyo on November 15.
A woman holds a candle atop a miniature replica of the Eiffel Tower during a candlelight vigil Saturday, November 14, in Vancouver, British Columbia.
Front pages of Japanese newspapers in Tokyo show coverage and photos of the Paris attacks on November 14.
An electronic billboard on a canal in Milan, Italy reads, in French, "I'm Paris," on November 14.
The Eiffel Tower stands dark as a mourning gesture on November 14, in Paris. More than 125 people were killed in a series of coordinated attacks in Paris on Friday. People around the world reacted in horror to the deadly terrorist assaults.
Lithuanians hold a candlelight vigil in front of the French Embassy in Vilnius, Lithuania, on November 14.
Thousands gather in London's Trafalgar Square for a candlelit vigil on November 14 to honor the victims of the Paris attacks.
A woman lights candles at a memorial near the Bataclan theater in Paris on November 14.
A man places a candle in front of Le Carillon cafe in Paris on November 14.
A woman holds a French flag during a gathering in Stockholm, Sweden, on November 14.
Nancy Acevedo prays for France during the opening prayer for the Sunshine Summit being held at Rosen Shingle Creek in Orlando, Florida on November 14.
French soldiers of the United Nations' interim forces in Lebanon observe the national flag at half-staff at the contingent headquarters in the village of Deir Kifa on November 14.
A couple surveys the signature sails of the Sydney Opera House lit in the colors of the French flag in Sydney on November 14.
A woman places flowers in front of the French Consulate in St. Petersburg, Russia, on November 14.
Candles are lit in Hong Kong on November 14 to remember the scores who died in France.
A woman lights a candle outside the French Consulate in Barcelona, Spain, on November 14.
Britain's Prince Charles expresses solidarity with France at a birthday barbecue in his honor near Perth, Australia, on November 14.
The French national flag flutters at half-staff on November 14 at its embassy in Beijing.
Dutch Prime Minister Mark Rutte after a speech on November 14 in The Hague following the attacks.
Japanese Prime Minister Shinzo Abe becomes emotional after his speech on the French attacks during the opening ceremony of a Japanese garden in Istanbul, Turkey, on November 14.
A woman mourns outside Le Carillon bar in the 10th district of Paris on November 14. The attackers ruthlessly sought out soft targets where people were getting their weekends underway.
People lay flowers outside the French Embassy in Moscow on November 14.
Mourners gather outside Le Carillon bar in the 10th district of Paris on November 14. "We were listening to music when we heard what we thought were the sounds of firecrackers," a doctor from a nearby hospital who was drinking in the bar with colleagues told Le Monde. "A few moments later, it was a scene straight out of a war. Blood everywhere."
People attend a vigil outside the French Consulate in Montreal. Prime Minister Justin Trudeau offered "all of Canada's support" to France on Friday, November 13, in the wake of the attacks.
Police show a heightened presence in Times Square in New York on November 13, following the terrorist attacks in Paris.
People light candles at a vigil outside the French Consulate in Montreal on November 13.
University of Nevada, Las Vegas, fans observe a moment of silence for the victims of the terrorist attacks in Paris before a basketball game November 13.
The house lights are shut off and scoreboard dark as Boston Celtics players pause for a moment of silence for the Paris victims before an NBA basketball game against the Atlanta Hawks in Boston on November 13.
People light candles at a vigil outside the French Consulate in Montreal on November 13.
Western intelligence agencies had attempted to track Abdelhamid Abaaoud, a Belgian citizen thought to be in Syria, but they weren't able to locate him, the source told CNN on Tuesday.
Read more: Who is the suspected ringleader?
Abaaoud had been implicated in the planning of a number of terrorist attacks and conspiracies in Western Europe before the Paris attacks.
Believed to be close to ISIS leader Abu Bakr al-Baghdadi, he was linked to a plan to attack Belgian police that was thwarted in January. He has since been featured in ISIS' online English-language magazine. His current whereabouts are unknown.
Analysis: The inconvenient truth about war on ISIS
Tim Lister and Margot Haddad contributed from Paris; Nima Elbagir from Brussels; Evan Perez and Shimon Prokupecz contributed from Washington; Jethro Mullen wrote from Hong Kong; Kevin Conlon, Ashley Fantz, Catherine E. Shoichet and Brian Walker wrote from Atlanta.