A teenager exposed himself to people out walking in a popular park.
He was part of a group of youngsters hanging around below the aquaduct at Muiravonside Country Park on Tuesday.
They were heard shouting at passers-by, but the youth - thought to be in his mid teens - took things further, upsetting people walking in the area.
He had brown hair and was wearing a blue and red striped top.
Police in Grangemouth are appealing for information about the incident.
Anyone who can help should call 101.