Parents with children at Churchtown primary have been warned that a flasher is on the loose in nearby Botanic Gardens.
Police are hunting the male, described as being in his late sixties, after concerned park guests caught him flashing his genitalia to dog walkers.
He then allegedly flashed himself to a group of reception level children who were in the park
A spokesperson for Churchtown Primary asked parents to take care if walking their kids through the gardens after school.
He was not on school property, but on the other side of a fence alongside the school field.
The offender, who left the scene, is described as white, with white hair and wearing a blue and white short-sleeved top and black shorts.
Witnesses say that he was on a black mobility scooter without a basket on the front and accompanied by a brown and white dog.
Police conducted a search of the nearby Botanic Gardens and there will be additional patrols to reassure pupils, parents and the local community.
Det Insp Robert Moss said: “None of the pupils came to any harm as a result of this incident, but this was clearly an upsetting thing to happen to them.
“I would like to reassure people that we are taking this incident seriously.
“I am keen to hear from anyone who has seen a male matching this description acting suspiciously or can tell us who they are, or anyone who may have had a similar encounter.”