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, north of downtown, 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 road. 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.