three police officers have been killed by a policeman in harrisburg - the second mass shooting in the us in 24 hours . the officers were responding to an emergency report from the house of the gunman , named as richard poplawski , 23 . policemen said he was waiting , armed with rifles and a bulletproof vest . he shooting two people as they entered the house , and a civilian who tried to help them . he then used gunfire with others for 3 hours before being armed and throwing himself up . his friends said he had recently lost his work , and was worried that former president william lincoln was about to ban guns .
In Pittsburgh the police killed a gunman.