From the Globe and Mail:

Dozens of amateur videos and photographs, willingly provided by an outraged public, have helped police in Montreal make fresh arrests in the wake of Monday's hockey riot.

In a modern twist on the age-old art of snitching, citizens are e-mailing photos, offering amateur videos and turning to police websites to help investigators identify individuals involved in the downtown fracas.

Police credit public co-operation for boosting the number of riot-related arrests yesterday to 23.

For example, police posted six new photos of rioters on a department website yesterday, some showing vandals damaging a police car. All were provided by people mixed in with the throngs of revellers marking the Canadiens' first-round playoff series victory.