A £1,000 reward is being offered for information leading to the arrest of a convicted rapist who absconded from an open prison.
Stephen Tierney, 39, has not been seen since 3 July when he walked out of HMP North Sea Camp, near Boston.
Lincolnshire Police say they are investigating possible sightings in Norfolk, Northamptonshire and Leicestershire.
The force say Tierney poses a risk to the public and has advised people not to approach him.
A police spokesman said he also poses a "high risk" to anyone who enters in to a relationship with him.
Anyone with any information about Tierney's whereabouts is asked to contact CrimeStoppers on 0800 555 111 or report online at crimestoppers-uk.org.