A woman has been sexually assaulted at a beach in Albany.
The attack occurred at 9.20pm on Tuesday as the 43-year-old woman was walking down a set of stairs to Emu Point Beach.
A man approached the woman from behind and grabbed her left shoulder.
He knocked her out and when she regained consciousness a short time later she found she had been sexually assaulted.
The offender is described as between 30 and 35 years of age, fair-skinned, 185 to 188cms tall, with brown hair and a brown goatee beard.
He was wearing a dark blue or black parka-style jacket.
Anyone with information can call Crime Stoppers on 1800 333 000.