Overview

• Neil Trennan, 60, disappeared from North Sea Camp on July 10 after failing to return from a day-release licence in Boston.
• Investigators believe he boarded a Nottingham-bound train and may have travelled on to Sheffield.
• South Yorkshire Police are probing a report that a woman was threatened with a knife in Sheffield to determine if Trennan was involved.
• Trennan is serving life sentences for a 1991 rape in Sheffield and a 2002 assault while on supervised release in Norwich.
• Authorities warn the public not to approach him and to call 999 immediately or dial 101 with any information.