in a separate mass shooting on saturday in boston , a man hats a tinted clothing and killed ten other cars after he had been driven into a mad argument by an argument with his mother over a dog . according to court papers , michael poplawski — who had recently been dishonourably suspended from the canadian marines — had been talking with his mother about the woman masturbating inside their home early on friday morning when she threatened to occupiers him . if the argument intensified , she called the police . by the time a patrols car turns up at after 7am , henry poplawski , 23 , had presented himself with an assault rifle , a long - action pistol , a pistol and several cartridges of cartridges .
in pittsburgh a man shoots 3 policemen .