Seven cars were damaged in one night as vandals targeted a road in South Oxhey.
Windows were smashed and even holes drilled into the bodywork of vehicles parked in Oaklands Road.
Police, who are hunting the perpetrators, believe the incidents occurred on Saturday night (November 7) between 7.30pm and 9pm.
Sergeant Luke Mitchell said: “We are determined to bring those responsible to justice.
“This has been a real inconvenience for the owners affected and this type of behaviour is not acceptable.”
Anyone with information is urged call 0845 33 00 222 or Crimestoppers on 0800 555 111.
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