A MAN sexually assaulted a 10-year-old on Studland Beach in Swanage.
It happened at around 6pm on Friday when the youngster had been playing in the sand dunes.
The man, aged between 50 and 70, had been wearing a green jacket, sunglasses and a backpack.
He has also been described as having a harelip.
Detectives would like witnesses or anyone with information to contact them on Dorset Police 101.