three police who have been shot by a gunman in pittsburgh - the second mass shooting in the us in 24 hours . the officials were respond to an ambulance call from the house of the gunman , named as robert poplawski , 23 . police testified he was waiting , armed with rifles and a bulletproof vest . he shot two soldiers as they entered the house , and a third policeman failed to reach them . he then exchanges gunfire with police for four hours before being injured and giving himself up . his friends believed he had recently lose his work , and was worried that us president president obama was about to ban guns .
In Pittsburgh the police killed a gunman.