A man has been arrested after reports of a group throwing stones at cars on the M25 from a bridge.
Surrey Police said on social media that it had arrested a man in his 20s on suspicion of conspiracy to cause criminal damage and causing danger to road users following alleged incidents in Reigate Hill.
The force said it had received recent reports of a group of men on e-bikes throwing stones on to the motorway from the M25 flyover, as well as on to the A217 from the Reigate Hill footbridge.
A spokesperson for the force said the suspect remains in custody and they are continuing to investigate the incidents, which were mostly reported between 22:00 and 01:30 BST.
Anyone with information is urged to contact Surrey Police.