Police are hunting a convicted murderer who has absconded from Leyhill prison in South Gloucestershire.
People are urged not to approach Craig Black who has not been seen since 16:45 BST on Monday.
Black, who was jailed in 1995 and transferred to Leyhill this month, was found to be missing when he was checked on at 20:30.
Avon and Somerset Police said he was known to have links with Marlborough, Wiltshire and Birmingham.
"We are keen to trace him and would urge anyone spotting him to contact us on 999," a spokesman said.