Police are trying to trace two men who have absconded from an open prison in Gloucestershire.
Stephen Rees, 31, and Liam Aherne, 24, left HMP Leyhill on Wednesday evening.
They are believed to have connections in the Rhymney Valley as well as the Merthyr area.
Avon and Somerset Police says there may be a potential risk to the public.
Anyone who says these two men or anyone who may know their location is asked to call police on 101.