uk news: No one was injured during the incident at the Harmondsworth detention center in West London.
It is understood that a group of detainees left their rooms and went into the courtyard at the immigration center armed with various weaponry.
There was a power cut at the premises in the early hours of Saturday.
The power was still out at the premises in west London just before 0900 GMT and the Home Office said work was underway to resolve the issue.
The government said no detainees had left the premises and those involved had since been returned to their rooms.
