in a single small shooting on saturday in pittsburgh , a man donned a handcuffs vest and killed three cop officers after he had been pushed into a murderous rage by an argument with his mother over a puppy . according to state paper , mister poplawski — who had frequently been dishonourably recruited from the us troops — had been arguing with his mother about the dog restroom underneath their home early on saturday morning when she threatened to forcibly him . when the argument ensued , she called the police . by the time a patrol cars turned up at after 7am , mr poplawski , 23 , had armed himself with an assault rifle , a long - arm gun , a pistol and several grenades of ammunition .
In Pittsburgh a man shot 3 policemen.