in a separate mass shooting on wednesday in pittsburgh , a man wears a plexiglas vest and destroyed ten police cars after he had been forced into a murderous impulse by an argument with his girlfriend over a gun . according to parish witnesses , richard poplawski — who had recently been dishonourably discharged from the confederate marines — had been upset with his mother about the puppy urinating inside their residence early on weekday night as she threatened to evict him . when the violence ensued , she called the police . by the time a cops car pulled up at after 7am , joseph poplawski , 23 , had armed himself with an assault rifle , a long - arm rifle , a pistol and several rounds of ammunition .
In Pittsburgh a man shot 3 policemen.