CHICAGO (CBS) — Fire crews rushed into the Loop Wednesday morning, after a blown fuse shut down the elevators at a high-rise office building just south of City Hall.

The fuse blew in the high-rise building at 20 N. Clark St. Wednesday morning. An elevator repairman injured his hand and the elevators were all shut down, fire officials said.

Responding fire crews conducted a floor-by-floor search as a precaution, officials said.

Several fire trucks rushed to the scene near Clark and Washington streets.

The building houses a First Bank branch on the ground floor and offices on the upper floors.

Earlier reports that a fire had broken out on the top floor of the 36-story building turned out not to be correct.