in a separate mass shooting on saturday in philadelphia , a man wear a bulletproof vest and killed three uniformed cops after he had been dragged into a deadly rage by an angry with his sister over a dog . according to courts papers , richard poplawski — who had subsequently been dishonourably discharged from the uk marines — had been struggling with his wife about the puppy spitting inside their home early on sabbath morning when she threatening to evict him . when the fight erupted , she called the police . by the time a patrol cruiser turned up at after 7am , mr poplawski , 23 , had armed himself with an assault rifle , a one - hand rifle , a pistol and several grenades of shells .
In Pittsburgh a man shot 3 policemen.