Calgary police are asking for the public's help following a sexual assault early this morning.

A home invader got into a house on Brookpark Drive Southwest, entering through an open window on the main floor, and went to the basement where a young woman was asleep.

“Once inside, the man made his way into the basement bedroom of a woman in her 20s. The woman woke to find the man standing over her, at which point she was sexually assaulted,” police said in a news release.

“At some point during the assault, the victim kicked the man, knocking him over. The victim was able to run to her parent’s bedroom and call for police. The man fled the residence and was not located upon police arrival.”

Staff-Sgt.Bev Voros said Calgary police are looking at possible high-risk offenders.

"We are working with our "hirop" unit now, working on whether there's any known sexual offenders, if there is any known offenders," Voros told CBC News. "Our analyst is working on this right now. We're going to the public for assistance. If anyone saw anything, this is a big concern for us."

Voros said police don't know whether the woman or the home were targeted.

The home invader is described as 5 feet 8 inches tall with a medium build. He wore a dark-coloured, hooded sweatshirt and smelled strongly of cigarette smoke.