Between 10.40pm and 11pm on Friday, October 19, offenders were seen throwing stones and bricks at parked cars in Quakers Lane.
They were also seen jumping on bonnets before running off.
The incident was reported to police just before 10.40am on Saturday.
•Enquiries are on-going and anyone with information is asked to contact Hertfordshire Constabulary via the non-emergency number 101, quoting crime reference 41/48099/18 or report information online at www.herts.police.uk/Report.
