(CNN) New body cam footage released in Chicago on Wednesday shows the fatal police shooting of 22-year-old Anthony Alvarez as he runs from an officer.
Alvarez was armed with a gun at the time, according to police. Newly released surveillance camera footage showed Alvarez dropping what appeared to be a gun onto the grass nearby as he was shot on March 31.
Body cam footage, released by Chicago's Civilian Office of Police Accountability (COPA), showed two officers later acknowledging that a handgun was on the grass near Alvarez.
Body cams videos of responding officers show them chasing Alvarez by car, and then on foot, in the early morning hours. The shooting prompted Mayor Lori Lightfoot and two other city officials to jointly call for a revised police foot pursuit policy as "quickly as possible."
When one officer rounds a corner several feet behind Alvarez, in a residential neighborhood in northwest Chicago, the young man is seen in bodycam footage with his back to the officers.
Alvarez had a gun in his right hand at that point, Chicago Police Chief of Detectives Brendan Deenihan said in a briefing with reporters.
Just two days before the shooting, a Chicago police officer shot and killed 13-year-old Adam Toledo after the boy was seen holding a handgun at the end of a foot chase.
Lightfoot, Alderman Ariel Reboyras and Alderman Felix Cardona Jr. cited Toledo's shooting death in a statement released Wednesday afternoon. They called on the department to issue a new foot pursuit policy and said a "minor and inconsequential incident should never, and can never again, result in someone's death."
Chicago police told CNN they have not divulged the reason for the events that led up to the fatal shooting -- which are still under investigation.
In a separate statement with the Alvarez family, Lightfoot said, "The release of these videos will be the beginning of a long process of healing for the family, and for all those who knew and loved Anthony."
The statement continued: "This tragic event provides further motivation for the expediency for reform to the City's foot pursuit policies."
Attorney Todd Pugh, representing the Alvarez family, viewed the video and said afterward on Tuesday night, "It was an absolutely chilling scene and, as his mother indicated already, it has really left us with more questions than answers."
"I know what I saw, and I saw Chicago police officers shoot their son as he ran away from them," Pugh added.
In a statement on Wednesday, Alvarez's family asked why was he chased by police, what crime had he supposedly committed and how do police explain video showing he was shot in the back as he fled.
"Anthony's family and the residents of Chicago deserve answers to all of these questions," the statement said.
The Alvarez family remembered him as a gifted soccer player and "doting dad" to a 2-year-old daughter. The statement said Alvarez was "a kind-hearted young man" who set aside his dream of playing professional soccer and took a job at a meatpacking plant to support his girlfriend and their daughter.
"I can't believe he is gone. I really miss my son. I just want some answers," his father, Oscar Martinez, said. The family asked that demonstrations in Alvarez's name be peaceful.
In the footage, an officer is heard saying "Drop the gun!" twice and -- less than a second later -- he fired five times. The shooting is visible from both the officer's body cam video and a nearby home video surveillance camera.
"Why are you shooting me?" Alvarez yelled from the ground.
"You had a gun!" an officer responded.
At one point, the officer who shot Alvarez told another officer, "Cuff him! Cuff him!" and pulled out handcuffs. The other officer stopped him and said, "No, I'm going to render aid!"
"Stop moving! I'm trying to help you!" said the officer attempting aid Alvarez. "Stay with me! Stay with me man!"
Alvarez was later pronounced dead from multiple gunshot wounds, according to excerpts of a preliminary report from the Cook County medical examiner. Alvarez's death was declared a homicide, the report said.
Police were attempting to stop and speak with Alvarez, who was "an individual familiar to the officers," according to COPA.
Police have not said whether Alvarez was suspected of a crime, or what they wanted to speak with him about. It is unclear whether Alvarez knew why he was being chased by police.
In surveillance footage of the latter shooting, Alvarez can be seen walking out of a gas station convenience store when a police car with lights on begins to pursue him.
COPA said the investigation is ongoing but recommended the officer who fired the shots "be relieved of police powers during the pendency of this investigation."
Chicago Police Superintendent David Brown declined to offer his opinion on the incident until the investigation was complete. The officer has been placed on routine administrative leave, he said.
In the statement with Alvarez's family, Lightfoot called for calm after the release of video.
Lightfoot urged the public to take the time to look at both the real time and frame by frame footage of the raw video.
"I understand, having investigated many of these shootings, that officers are in many instances called upon to make split second decisions, particularly in instances like this one where there's a gun," Lightfoot told reporters before the video was released publicly.
She declined to comment on specifics of the investigation.
Lightfoot said she has asked that the police department's foot pursuit policy be revised.
"It's one of the most dangerous activities that officers engage in -- dangerous for themselves, dangerous for the person being pursued and dangerous for members of the public," the mayor said. "But it is unacceptable that a minor traffic offense resulted in death."
The city foot pursuit policy came under scrutiny last month when Toledo was shot on March 29.
Police said the gun was later recovered from behind the fence where the chase ended. In video, Toledo is seen turning to his left, toward the officer, and what police said was the gun disappearing behind his right side. Toledo began to raise his hands as he faced the officer when the officer fired his weapon.