Latest: A connection has emerged between the gunman and a Texas church where 26 people were killed as police described the victims as "defenceless people".

Latest: Police in Texas say a man who had just been fired from his job at a transportation company fatally shot an employee there before killing himself.

One of the suspected gunmen who opened fire outside a Texas art contest featuring cartoons of the Prophet Mohammed was known to the FBI since 2006, but despite more than 1,500 hours of surveillance, he was prosecuted only once, it has emerged.