Police are investigating an indecent exposure by a man to three teenage girls in St Albans on Monday.
The group were walking along a path in Jersey Lane near the entrance to Jersey Farm Woodland Park at around 3.30pm when they saw they man exposing himself.
The flasher ran away after being challenged by a member of the public.
He is described as white, aged between 40 and 50, of a slim build, and wearing a black hooded top and black cargo trousers.
A police spokesperson said he did not say anything to the girls and did not attempt to touch or approach them.
Anyone with information is asked to contact Herts Police on the non-emergency number 101.
Alternatively call Crimestoppers anonymously on 0800 555 111.
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