The Radnor Township Police Department is looking for some who has been throwing rocks at cars from the Radnor Trail overpass on West Wayne Avenue.
Six incidents have taken place since Christmas Day; two of them were on Christmas.
The rocks have caused some damage to cars, but miraculously there have been no injuries, said superintendent of police William Colarulo. When rocks are thrown at cars, "Someone can easily lose control," he said.
To report information on these crimes, call 911 or the anonymous tip line at 610-687-8851.
The incidents took place on December 25 at 10:48 p.m. and 10:59 p.m., December 31 at 10:46 a.m., January 1 at 7:51 p.m., January 6 at 8:30 p.m., and February 4 at 3:12 p.m.