A police dog tracked a suspect in an attack on an Edmonton, Canada photo radar van on Saturday. The driver was not injured when a rock was thrown into the back window of the van around 10 p.m. A dog that had been brought to the scene tracked a suspect matching the description of a man seen fleeing the seen, but no charges have been filed.

Nine vans were smashed last year, including a December attack that left a van dented with three windows smashed. Police are now considering placing police dogs inside photo radar vans.

The call to have cops team up with van operators has been made before, said Ward 4 Coun. Jane Batty, one of two councillors on the Edmonton Police Commission. And police may develop better ways to prevent the attacks after arresting a culprit and asking why they did it, she said.