Police are hunting a balding man aged between 40-60 who pulled up beside a 16-year-old girl and exposed his private parts before driving away in a silver van with livery on the sides.
The incident happened on Friday, March 17, in the Lodge Drive area.
PC Ian Bleakley of Grangemouth Police Station said: “This was a concerning incident and there will be an increase in high visibilty patrols in the area as we continue to conduct our enquiries.
“As part of this we’d ask anyone who may have seen the vehicle in the area, or potentially captured this on private CCTV or dash-cam footage, to get in touch.”
Anyone with information is asked to contact Police Scotland on 101 or Crimestoppers anonymously on 0800 555 111.