At least 11 firefighters have been injured in a blast that happened while they were responding to a massive commercial building fire in downtown Los Angeles.

Firefighters initially responded to a report of a fire at a one-story commercial building around 6:30pm, and there was “nothing unusual” until the explosion occurred after they entered the building.

The Los Angeles Fire Department immediately issued a major emergency “mayday” call, sending more than 200 others to the scene to contain the blaze that jumped to several neighboring buildings.

Major fire in Little Tokyo/downtown Los Angeles at San Pedro and Third. Dangerously close to Skid Row residents, senior and low income housing. Major smoke screen, ash is raining for blocks.

The condition of the injured was not immediately clear, as Los Angeles Mayor Eric Garcetti tweeted: “My thoughts are with our brave @LAFD firefighters.”

Sounded like a flyover but no. FIRE! A few blocks away from my loft in

The fire was largely brought under control in about an hour, but multiple fire crews remain at the scene.

URGENT: Massive explosion in #LA— debries raining from the sky

The cause of the fire has yet to be determined, as well as what exactly was inside the building that caused the blast. The fire apparently started at a warehouse belonging to “a supplier for those who make butane honey oil,” better known as cannabis oil, according to LAFD Capt. Erik Scott.

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