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At least 30 people were killed after a massive hotel explosion in Havana, Cuba's health ministry says

Havana(CNN) At least 30 people are dead and at least 24 remained hospitalized Sunday after Friday's explosion at the Hotel Saratoga in Havana, the Cuban health ministry said.

On Saturday, Cuban state media reported 32 dead, and Cuba's presidency said 26 were killed. It's not clear what led to the discrepancy.

Rescue workers continued searching the hotel's ruins Sunday, and officials said they believe more bodies remain inside the structure.

The state-run company Gaviota, which manages the hotel, said 11 workers died in the blast and 13 remain missing. A Cuban American woman is among the injured, according to Dalila Alba González, a Ministry of Tourism spokesperson.

A gas leak is thought to be the cause of the explosion, according to the Cuban Presidential Office, which said more details would follow.

"Everything indicates that the explosion was caused by an accident," the Cuban Presidential Office tweeted.

According to preliminary data, a child and a pregnant woman were among those who died, the presidential office said.

The presidency also said 64 people have been hospitalized for injuries, including 14 minors.

Cuban state TV said there are potential survivors trapped in the basement of the destroyed hotel.

Witnesses described a "massive blast," which appeared to destroy buses and cars outside the hotel in the center of the city.

Images from the scene showed the blown-out facade of at least three floors of the ornate green-and-white stuccoed building. Plumes of dust and smoke could be seen rising around debris on the ground.

A CNN team on the ground saw a bloodied woman being carried away at the scene of the explosion. Firemen were using their bare hands to move chunks of broken granite and stone in order to pull people out of the rubble.

Pieces of metal awnings, balconies and large chunks of stone were scattered about 300 feet away from the hotel.

Cuban President Miguel Diaz-Canel visited the site of the explosion Friday, as well as the Hermanos Ameijeras hospital, where some blast victims were taken, according to images shared by the Presidential Office on Twitter.

He said the explosion was "not a bomb nor an attack, it's a regrettable accident."

Mexico's foreign minister tweeted his solidarity with the explosion's victims. "Our solidarity to the victims and those affected as well as the people of that dear fraternal nation," Marcelo Ebrard said in a tweet.

The hotel was built at the end of the 19th century. By the 1930s, it was one of the most important hotels in Havana.

It has 96 rooms since reopening in 2005 after refurbishment, according to its website. Personalities such as writer Rafael Alberti have passed through its doors.