Police say that an attack on a man who was shot with an arrow at a Calgary parkade early Monday morning was targeted.

Stuart Brideaux, of Calgary Emergency Medical Services, told CTV Calgary that the man, who is in his 20s, suffered a penetration wound to his shoulder.

Despite the injury, the victim drove himself to a downtown clinic at approximately 3 a.m.

He was transported from the clinic to Foothills Hospital in life-threatening condition. He is now listed in serious but stable condition.

Officers blocked off a parkade on 4 Avenue Southwest, where the arrow attack took place.

Calgary Police say the victim is co-operating with police.

Police have yet to determine a specific motive, and they are working to put together a suspect description.

Insp. Michael Watterston said the incident is strange and he has never encountered anything like it in his nearly 30 years of policing.

"In my 27 years, I've never heard of an incident with an arrow involved," Watterston said.

It's unclear whether the victim was shot with a crossbow or a standard bow.

Police are asking anyone with information about the incident to contact them at 403-266-1234, or Crime Stoppers at 1-800-222-8477.