Police are continuing to hunt a "dangerous and predatory individual" who is suspected to have committed a serious sex offence while on the run.
Ivan Leach, also known as Lee Cyrus, 47, went missing from North Sea Camp open prison in Boston, Lincolnshire, after he failed to return from day release on October 9.
The public are warned not to approach him under any circumstances as he poses a significant risk.
He is believed to have carried out a very serious sexual attack in Tayside, Scotland, since he absconded although further details cannot be released for legal reasons, said Lancashire Police.
Despite a large-scale police search and numerous reported sightings he remains at large.
Police are urging the public to be vigilant and to come forward with information about his possible whereabouts.
Preston-born Leach has visited his home city on a number of occasions since he absconded but he could be anywhere in the country. Inquiries are also ongoing in Nottinghamshire, Lincolnshire and Tayside.
Lancashire Police are also investigating reports that two schoolgirls were approached for sex as they sat at a bus stop around 6.30pm on Lancaster Road in Preston city centre on Wednesday October 17.
The girls were spoken to by a man who matched Leach's description and made sexual remarks towards them as he encouraged them to participate in sexual activities with him. The girls boarded their bus and reported the incident to the police.
Leach was jailed in 2005 for robbing a 90-year-old woman in Ribbleton. He was given a life sentence with a minimum tariff of five years. He also has convictions for burglary, robbery and assault.