Firefighters in the District on Saturday went to a rooftop fire at a building under constuction, but nobody was injured.

Fourteen workers were on the roof when the fire began shortly before 11:30 a.m. at the building in the 2200 block of California Street Northwest, said Tim Wilson, a spokesman for the fire department. All were able to escape uninjured, he said. The cause of the fire has not been detrmined yet, he said.