Two students were surprised on Friday by a serial flasher who preys on young women near Oaklands College in Borehamwood.
Police are appealing for any information on the identity of the plump culprit who has been stalking the alleyway by the college near Elstree Way and Studio Way for months.
In the latest incident the two girls were suprised by the man who jumped out from behind bushes and exposed himself at around 9.30am.
DC Akin Odunlami of Borehamwood police said: "The girls were obviously very upset and reported it to police."
He said police were linking the incident to previous sightings in the same area.
The man was white, 5ft 6ins tall, in his mid 30s, with brown hair, and of heavy build.
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