Disturbances broke out overnight in all four wings of the UK's largest immigration detention centre and a number of fires were started.

The Metropolitan Police said they were called at about 0040 GMT and officers were providing assistance at the scene, near Heathrow airport. Fire crews are also on standby.

A Home Office spokesman said specialist prison officers were drafted in when several fires were lit in the early hours, setting off the sprinkler system.

He said the situation was ongoing. There were no reports of injuries to staff or detainees.

"Police have assisted the prison and immigration services by securing the perimeter and there is absolutely no risk to the public," he added.

The centre, which can hold up to 501 people currently has 482 people staying there.