3 dc officer have been killed by a gunned in cleveland - the sixth mass shooting in the states in 24 hours . the officers were responding to an emergency call from the house of the gunman , named as richard poplawski , 23 . police said he was waiting , and with knives and a bulletproof cloak . he shot two others as they entered the house , and a third who tried to help them . he then trading firing with police for four hours before being injured and letting himself up . his colleagues said he had recently lost his gun , and was worried that our ambassador barack he was about to ban pistols .
In Pittsburgh the police killed a gunman.