seven police could have been killed by a gunman in pittsburgh - the second mass shooting in the united in 24 hours . the officers were responding to an emergency call from the home of the gunman , named as peter poplawski , 23 . she said he was waits , armed with pistols and a helmets mask . he shot the officers as they approached the house , and a fourth who tried to help them . he then traded arms with people for four hours before being injured and holding himself up . his friends said he had completely lost his office , and was terrified that us president michelle obama was about to sell guns .
In Pittsburgh the police killed a gunman.