A fire that forced the evacuation of a South Michigan Street sheet metal plant started in a dust bin, police and fire officials said.

Firefighters responded to the report of flames that broke out inside General Sheet Metal Works at 2025 S. Michigan St. at 7:45 p.m. Wednesday.

As workers were evacuated, smoke engulfed a large area inside the building, spilling out onto South Michigan, where police blocked off the street for about six blocks.

There were no injuries, a fire official said, adding that the situation was brought under control at about 8:15 p.m.