GLENDALE, Ariz. - Police are investigating after a man had to be taken to the hospital with life-threatening injuries after he was stabbed about 4 a.m. Tuesday.

Police believe they know the person who did this, and that the victim and suspect know each other.

The suspect got away from the scene near 63rd Avenue and Camelback Road, and the search for him is underway.

Police have been looking at neighboring houses, on walls and in backyards.

There's no word on victim's condition.