The other injured firefighters suffered minor burns, cuts and smoke inhalation.
The seven injured firefighters were treated at hospitals for minor injuries and released.
The four injured firefighters were treated for minor burns and smoke inhalation.
Of the other two injured firefighters, one suffered burns to his knees, and the other, a back injury.
The two injured firefighters were treated at a hospital and released.
But after falling to the basement, the injured firefighters used their radios to transmit calls for help, fire officials said.
Most of the injured firefighters suffered from smoke inhalation and, although three were hospitalized, none were in serious condition.
With four doctors to a stretcher, the injured firefighters were hustled out.
The two injured firefighters were not badly hurt, he said.
Some of the injured firefighters received electric shocks as well as minor burns, the Commissioner said.