Police in Calgary are looking for a man who broke into a woman's home early Wednesday morning and sexually assaulted her.

The woman, who is in her 40s, was asleep in her residence in the 5800 block of Maddock Drive N.E. just after 3 a.m. when the attack happened.

Investigators said the suspect is a white man, 25- to 30-years-old and six feet tall with a thin build.  He weighs about 150 lbs and has a medium complexion.

The suspect had short, light-brown hair, dark eyes and he was wearing a blue or grey T-shirt and dark pants. He fled in an older, compact, dark, regular-cab truck, police said. 

"No indication this is a targetted offense. This could be a random attack or an attack of opportunity," said acting staff Sgt. Jeff MacQueen from the sex crimes unit.

Anyone with information about the attack is asked to call the sex crimes tip line at 403-206-8175, or Crime Stoppers at 1-800-222-8477.