Authorities say there has been a partial collapse of a building under construction at Temple University in Philadelphia.
A spokesman for the city Fire Department says no injuries have been reported Thursday at the six-story structure.
Executive Fire Chief Richard Davison says the collapse happened on the fourth floor. He says firefighters are now helping to rescue an unknown number of workers on the upper floors.
Pictures and video of the building show fallen metal girders on one side of the building.
A university spokesman did not immediately respond to a request for comment.