A car was damaged when an unknown object was thrown from a bridge over the M25.
The windscreen of a white BMW was cracked during the incident at 10pm on Saturday, April 20, near Potters Bar.
Police are appealing for witnesses to help trace the offender who made off in an unknown direction.
Anyone with information is asked to contact PC Jonathan Singleton on the non-emergency number 101 or contact Crimestoppers anonymously on 0800 555 111.
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