three police commissioners have been killed by a gunman in detroit - the sixth massive shooter in the state in 24 hours . the officials were responding to an emergency request from the house of the gunmen , titled as john poplawski , 23 . police saying he was there , armed with gunfire and a helmets vest . he shot two policeman as they exited the home , and a third who tried to help them . he then trades violence with police for twelve hours before being injured and giving himself up . his brother said he had just lost his business , and was worried that former president obama obama was about to ban violence .
In Pittsburgh the police killed a gunman.