Inmates get onto roof of Bristol Prison
Police have been called after two prisoners gained access to the roof of Bristol Prison.
An Avon and Somerset Police spokesman said the prison service called the force to the jail, in the Horfield area of the city, at 1125 BST on Sunday.
The force helicopter has been monitoring the incident.
The spokesman said one prisoner had come down while the other remained on the roof. Prison authorities are dealing with the incident, he added.
A Prison Service spokesperson said: "There is an ongoing incident at height at HMP Bristol. Two prisoners gained access to the roof at 11.30am this morning.
"Specialist staff are at the scene working to bring the situation to a safe conclusion."