Two firefighters suffered injuries as they were battling a fire at a building under construction in San Francisco's Mission District early Wednesday morning.

According to the San Francisco Fire Department, crews were called to a building on the 2500 block of Chestnut Street, near Richardson Avenue and Broderick Street, around 4:15 a.m.

Chief Dean Crispen said when the first unit arrived, firefighters saw what was described as a "heavy amount of fire" coming from the second floor of the building. The fire had spread into the third floor and into adjacent buildings.

As crews were battling the fire, two firefighters who were on the third floor were injured when then fell through holes in the floor. A mayday was called and the injured firefighters were taken to San Francisco General Hospita

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