three police officers have been killed by a rampage in pittsburgh - the seventh mass shoot in the united in 24 weeks . the members were responded to an emergency summons from the house of the gunman , named as george poplawski , 23 . police said he was waiting , attacking with pistol and a bulletproof vest . he shot eight officers as they entered the house , and a third then rushed to aid them . he then traded gunfire with people for sixteen times before being injured and throwing himself up . his relatives suggested he had already lost his job , and was worried that former president barack president was about to suspend guns .
In Pittsburgh the police killed a gunman.