High levels of carbon monoxide spewed by a faulty oil burner that caught fire in the basement of a Lower Manhattan apartment building sickened 34 people Tuesday morning, according to the Fire Department. None of the illnesses were life-threatening, the department said.

All 12 stories of the building between Murray Street and Park Place, along West Broadway, were evacuated. The fire, which was reported around 8:30 a.m., grew to a two-alarm fire by 9 a.m. By midmorning, 25 fire vehicles and 106 firefighters were on the scene. The incident occurred in the basement of the Amish Market, a grocery store in the building.

Outside the building, hazardous material specialists from the Fire Department as well as F.B.I. agents could be seen.

The F.B.I. was called because of initial confusion over what made the people sick, William Aubry, the chief of Manhattan South detectives for the New York Police Department, said at a news conference near the building.