Smart: Murdered a teenager

Detectives hunting the pair had been focusing their efforts on a series of addresses in their home towns in Wales.

Smart and Young's escape sparked a large-scale manhunt.

It is not known if they escaped together but Gwent Police began checking a number of address with whom the prisoners are associated.

A third man, known only at this stage as Mr Crowley, who was serving 11 years for robbery, also absconded from Leyhill at the same time.

He remains unaccounted for.

Forces across Britain were sent details of all three men.

Smart was convicted of the murder of teenager Haydn Jones in Nelson, south Wales, at Cardiff Crown Court in 1986.

He strangled the teenager as he walked home.

Young: Scars on his head

He is white, of stocky build, with brown eyes and cropped dark brown hair, clean shaven and with a tattoo on his right upper arm of a skull and dagger and another on his left upper arm of the names Mam, Dad and Wayne.

He absconded from the open prison in July 1997 but gave himself up, accompanied by his family, two days later.

Young was convicted of murder at Newport Crown Court in 1985.

He is white, slim, with brown eyes, balding light brown hair, a fair goatee beard and two 1in scars on the left side of his head.

He wears glasses or contact lenses and has a tattoo of a tiger on his right forearm and a flying panther on his left forearm.