Six people are still missing after a major bridge in the US city of Baltimore near Washington collapsed on Tuesday after a ship crashed into it, the state Secretary of Transportation, Paul Wiedefeld, said at a press conference. At least two people have been rescued following the collapse of the Francis Scott Key Bridge after a cargo ship hit the structure, the local fire authorities said. Baltimore, located in the state of Maryland, is about 62 kilometres north-east of the US capital. One person is in critical condition in hospital, Fire Department chief James Wallace said. Rescue efforts to f…