Five prison offers have been injured during violence outbreaks at Morton Hall in Lincolnshire in which home made knives were used.
A man who had scaled the roof of an Immigration Detention Centre in Lincolnshire has now come down.
The man from Malaysia, who was previously thought to be of Chinese origin is said to be OK and has been placed in a separate unit at Morton Hall for staff to talk to him. Ambulance crews have now left the site which officials say is returning to normal.
The man on the roof of an immigration centre in Lincolnshire is a Chinese national. Staff at Morton Hall near Lincoln said he took to the top of the 30 foot high building at 1130 BST.
Trained staff are on the roof trying to negotiate with the man who is not said to be making demands. Emergency services were on scene, although several fire engines have now left.
Lincolnshire police were called to a similar incident yesterday when a different detainee also got onto the roof but that was quickly resolved.
The UK Border Agency has confirmed the demonstrator on the roof of the Morton Hall centre in Swinderby near Lincoln is a detainee of the immigration centre.
– UK Border Agency spokesperson
"There is currently a peaceful protest ongoing at Morton Hall in which one detainee has scaled the roof.
"We are working with the Prison Service to resolve the situation."
A security alert has been sparked at an immigration centre near Lincoln after a man was seen climbing to the roof.
Lincolnshire Police say he was spotted on the roof of Morton Hall in Swinderby. There are reports the man may be holding a protest. The centre holds adult men who are subject to deportation and who require secure conditions.
More to follow.