Firefighters contained the flames to equipment on the roof and said the blaze posed no danger to occupants. It was extinguished in two hours and damaged only the building's exterior.,”

CHICAGO (AP) – Fire broke out on the roof of a 45-story office building Wednesday, sending some workers fleeing into the downtown streets.

Firefighters contained the flames to equipment on the roof and said the blaze posed no danger to occupants. It was extinguished in two hours and damaged only the building's exterior.

Authorities did not call for an evacuation, but assisted people who wanted to come out.

District Fire Chief Gregory Lewis would not discuss a possible cause, saying it was under investigation.

Two people who descended the stairs were hospitalized for exhaustion, Lewis said. Emergency workers were checking other people as a precaution.

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