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.
"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."
More top news
Largely fine and hot but with isolated thunderstorms.
Cooler with thundery showers.
The parents of a 17-year-old who died in a flat fire at Langley Mill have paid tribute to “an incredible son and brother.”