Yobs have been criticised for throwing a brick from a bridge in Sheffield - hitting a van below.
The brick was hurled from a bridge in Stradbroke and landed on the Mosborough Parkway below.
It struck a Ford Transit van, damaging its front bumper.
Inspector Jason Booth, of South Yorkshire Police, said: "This type of action could have had more serious consequences.
"The complainant was driving his van along Mosborough Parkway when a brick appears to have been thrown from the Stradbroke road bridge. The brick hit the bumper of the van causing some damage but fortunately no one was injured.
“Clearly this type of incident has the potential to cause injury or even a fatality and its seriousness cannot be stressed enough.
"It may appear to those responsible as perhaps just a laugh but throwing objects at vehicles moving at speed has the potential to kill.”
"We have had no other incidents recently, the last were sometime last year, where again this reckless behaviour put drivers at risk of injury.
“We will be paying attention to the Mosborough Parkway bridges as part of our patrols and anyone found responsible for this will face formal police action”.
Anyone with information about the incident at 9.30pm on on Thursday, September 15 should call South Yorkshire Police on 101.