COFFS Harbour police are investigating two separate but related child approaches in Coffs Harbour.
About 4pm on Saturday, two 14-year-old girls were walking east along the Park Beach Walking Track.
Police have been told a man approached the girls and asked if he could walk with them.
The girls turned and saw the man was committing a lewd act.
They ran from him but the man followed the children until they reached an open field at the end of the track, near Harbour Drive.
The girls went home and reported the incident to their parents.
About 4.30pm, two 11-year-old girls were playing in a tree on the same walking track when a man approached and spoke to them.
The girls have told police the man then performed a lewd act.
The man ran from the area when the mother of one of the children walked towards the tree.
Police from Coffs-Clarence Local Area Command are investigating the incidents which they believe are linked.
They would like to speak with a man who may be able to assist with their inquiries.
The man is described as being aged in his 20s, with a skinny build and dark brown hair.
He is described as wearing a grey shirt, beige or brown-coloured knee-length shorts, and green and black Nike-brand runners.
Police are urging anyone with information in relation to these incidents to call Crime Stoppers on 1800 333 000