Lincolnshire Police stepped up their appeal to find a convicted rapist after he absconded from an open prison in Boston.
Stephen Tierney, 39, did not return to HMP North Sea Camp on July 3 and has been missing ever since.
He was last seen in Boston Market Place and police said he may have used public transport to travel to Lincoln.
Tierney, who has connections to Northamptonshire and London, poses a medium risk of violence towards the public.
He is described as around five foot seven inches tall and of small build with brown/ginger hair. He also has a tattoo saying “wrist” on his right arm.
Any sightings or information should be reported to Lincolnshire Police on 101 quoting incident number 316 of July 3, or in an emergency call 999.