An inmate from North Sea Camp Open Prison has been charged with the attempted knife attack and sexual assault of a woman.
Police attended an incident at Queen Elizabeth Park, Manthorpe Road in Grantham at around 1pm on Friday following reports that a woman had been approached and threatened by a man.
The woman was not physically injured.
Officers attended the park and arrested 26-year-old Nicky Suddons, 26, who was on day release from the prison in Freiston Shore.
Lincolnshire Police has charged him with possession of a bladed article and common assault with the intention of committing a sexual offence.
He has been remanded into custody to appear before Lincoln Crown Court on July 15.