In Portland, police say a robber is using a pit bull as a weapon. Portland police report a father and son gave up their backpacks to a robber who threatened them with a pit bull. Officers say the pair was walking their bicycles along a Willamette River when Jan Leith Haga, Junior, 29, a transient approached them holding a leashed gray and white pit bull. He was holding the leash in a manner indicating that he was trying to hold the dog back from attacking, and demanded their backpacks. Police found Haga under a bridge a short time later with one of the backpacks and took him into custody. The pit bull was taken to animal control.