Man on the run after sexual assault at Noosa beach

Police are searching for a man who sexually assaulted an 18-year-old woman at Sunrise Beach in Noosa this morning.

Authorities say the woman was using a walkway adjoining David Low Way and Bicentennial Way when she was grabbed from behind and sexually assaulted by the man.

A local man passing by heard the disturbance and ran to her aid, causing the offender to flee the scene on foot.

The attacker is described as having a European accent, possibly French, and is about 180cm tall, police said. He was last seen wearing long dark pants and a red t-shirt.

Investigations are ongoing.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.