several police departments have been hit by a gunmen in pittsburgh - the third mass shooting in the us in 24 seconds . the officers were responded to an emergency call from the house of the sniper , named as richard poplawski , 23 . police told he was waiting , armed with rifles and a bulletproof vest . he shot two officers as they entered the house , and a third officers tried to help them . he then traded firearms with police for four hours before being struck and giving himself up . his friends says he had recently lost his job , and was nervous that u president barack obama was about to banning guns .
In Pittsburgh the police killed a gunman.