WA Police are searching for a person accused of assaulting a younger woman on Rottnest Island.

Detectives say he was attacked by a stranger between 10:15 and 12:30 on New Yr’s Eve in Thomson Bay.

She was mendacity on a towel whereas she was sunbathing on the favored seaside, sporting a black bikini with a white sundress on it.

Police stated there have been many individuals within the space on the time of the incident, which occurred north of the ferry port.

Anybody who remembers seeing a youngster or a person appearing suspiciously ought to contact Crime Stoppers on 1800 333 000.