Police are searching for thugs who threw a brick at a car from a railway bridge.
The brick was thrown from the disused bridge in Grange Road, Hugglescote, near Coalville, at 4.15pm on Thursday, July 31.
It smashed an approaching car's windscreen. The driver was not injured but was "shaken up", police said.
Police want to trace four boys, thought to be aged 12 to 16, who were in the area at the time. Two of them were riding bicycles and two of them were on foot.
Police community support officer Robert Inman said: "Although the driver of the car was not injured, he was shaken up.
"Clearly, this reckless action could have had serious consequences and I would ask that anybody who has information about this to contact us.
"We are also anxious to trace the four boys who were seen in the area about this time as they may have witnessed the incident or have information about who is responsible.
"If you know who they are, or you are one of them, please contact us."
Contact Pcso Inman on 101 or Crimestoppers, which is anonymous, on 0800 555 111.