Four US Marines have been shot dead at a Navy Reserve Centre in Chattanooga, Tennessee.<br /><br /> Local media citing law enforcement officials have identified the suspect as Muhammad Youssef Abdulazeez.<br /><br /> The gunman is also believed to have been responsible for a separate shooting at a Navy recruitment office ten kilometres away.<br /><br /> Police sources say the suspect was shot dead a couple of hours after he opened fire.<br /><br /> Bill Killian, US Attorney for the eastern district of Tennessee, urged the media not to “put a label” on the nature of the crime.<br /><br /> “The FBI and the other agencies are gonna investigate this case thoroughly. They will determine – after the facts are determined – whether it’s an act of terrorism at all, whether it’s a crime and what the nature of that crime is, or whether it’s a combination of those,” he told the press.<br /><br /> Officials say one police officer and a marine were injured in the attacks.