A small rooftop fire forced a short, temporary evacuation of the federal courthouse in Central Islip Friday, Suffolk officials said.

The fire was reported at 2:15 p.m.

Robert McGee, a chief with the Central Islip Fire Department, said a welder was fixing an air-conditioner unit on the roof of the 11-story courthouse when something caught fire and the smoke spread throughout the building. Some 100 firefighters responded and the fire was extinguished quickly, officials said.

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McGee said one building worker and about six Suffolk County police officers suffered smoke inhalation, but their conditions did not appear to be serious.

With Robert E. Kessler