in a separate mass shooting on saturday in pittsburgh , a man gloves a bulletproof vest and killed three deputy policemen after he had been thrown into a frantic state by an argument with his sister over a dog . related to court papers , robert poplawski — 22 had recently been dishonourably discharged from the usa forces — had been arguing with his mother about the dog dozing inside their home early on saturday morning when she threatened to evict him . and the arguments started , she threatened the police . by the timer a patrol car drove up at after 7am , dick poplawski , 23 , had braced himself with an attack rifle , a long - arm grenade , a pistol and several rounds of ammunition .
In Pittsburgh a man shot 3 policemen.