Vancouver police say a 21-year-old Surrey man and three teen accomplices have been arrested in the stabbing of a passerby who intervened in an altercation between an Olympic Village liquor store security guard and shoplifter on Saturday night.

The injured 63-year-old man may himself have been working as security personnel at another business, according to Vancouver police spokesman Sgt. Steve Addison.

"The injuries are quite serious. There was a significant amount of blood coming out of his wrist…