A top manager at security company G4S has said he warned his bosses three years ago about the "poor culture" at an immigration detention centre where 10 employees have now been suspended... G4S says it investigates all complaints and whistle-blowing rules are in place. Mr Ward quit the company in April 2014 because he felt his managers were not acting on his concerns and he "couldn't cope"...

Speaking to the BBC three years later, he said: "The vast majority were good, decent people - but there was a group that actually concerned me on their relationships with detainees. It was around language that they used, a sense of roughness and the use of force, how force was used."...

The programme was approached by a worker at the centre, 21-year-old Callum Tulley, who agreed to secretly film what happened during his shifts. The footage reveals suicide attempts, drug abuse and the results of violence inflicted by detainees on each other. However, it also shows G4S staff mocking, verbally abusing and even physically assaulting those in their care...