At least eight people were killed and 30 others injured after an explosion on Friday morning at the site of a historic hotel in Havana, Cuba.

The fatal explosion at Hotel Saratoga destroyed much of the building and is thought to have been caused by a gas leak after a preliminary investigation, the office of the Cuban presidency reported.

"Everything indicates that the explosion was caused by an accident,” the office said, according to CNN.

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Thirty people have been hospitalized, and firefighters are still at the site looking for people who may be trapped under the rubble, the report said.

Photos show nearly the whole front facade of the building is exposed with smoke billowing around.

Mexico's secretary of foreign affairs extended his condolences shortly after the incident.

"Our solidarity to the victims and those affected, as well as to the people of that dear fraternal nation," Marcelo Ebrard tweeted, according to a translation.

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The hotel, first built in the 1930s and reopened after a remodel in 2005, used to be frequented by Hollywood celebrities. It is now listed on the Cuba Prohibited Accommodations List Initial Publication for either being owned or controlled by the Cuban government.