CINCINNATI — Fire and emergency medical officials say a construction worker was killed and a tractor-trailer driver injured when an interstate overpass undergoing demolition collapsed in Cincinnati.

The Cincinnati Fire Department says the collapse onto southbound Interstate 75 happened near Hopple Street around 10:30 p.m. Monday.

Fire officials say southbound lanes were closed indefinitely. It wasn’t clear what caused the collapse.

Officials say several hundred tons of concrete fell onto the roadway. A tractor-trailer was damaged.

The driver was taken to the University of Cincinnati Medical Center with minor injuries.

A witness told WLWT5 that he heard “a real big boom” and then a couple of seconds later, he saw police cars rushing to the scene.