Vancouver police have released several surveillance photos of a "person of interest" in a downtown sex assault.

A woman was groped outside of her apartment building on Richards near Robson Street shortly after 3 a.m. on Oct. 9.

The 34-year-old woman was about to enter the building when a man allegedly approached her from behind and groped her.

She yelled and scared the suspect away. He was last seen walking quickly towards Robson Street.

The man is described as olive-skinned, 5'5 to 5'7 tall with a slim build, dark hair, a moustache and goatee.

If you recognize him, call the Vancouver Police Sex Crimes Unit at 604-717-0600 or Crime Stoppers at 1-800-222-8477.