Crimestoppers have offered up to £3,000 in reward for information about the wanted fugitive Ivan Leach.
The charity is offering the bounty for information leading to the arrest and conviction of Leach, who is on the run from an open prison.
Leach, 47, also known as Lee Cyrus, is described as “dangerous and predatory”.
He went missing from North Sea Camp, Boston, Lincolnshire on Tuesday, October 9 after day release.
Police have warned he should not be approached under any circumstances as he poses a significant risk.
Leach is thought to have committed a serious sexual attack in Tayside, Scotland, since he absconded and police are investigating reports that he made sexual remarks to two schoolgirls in Preston.
The last confirmed sighting of him was on Friday, October 19 in Lea, Preston. He was born in the city and also has connections in South Ribble.
It is known he has been in Preston on a number of occasions since he absconded, but he could be anywhere in the country. Enquiries are also ongoing in Nottinghamshire, Lincolnshire and Tayside.
Leach was given a life sentence with a minimum tariff of five years in 2005 for robbing a 90-year-old woman at her Ribbleton home.
His previous convictions include having sex with a 13-year-old schoolgirl and slashing a woman’s throat.
Det Supt Paul Withers, of Lancashire Police’s Force Major Investigation Team, said: “While we have been encouraged by the information provided by the public about Leach so far he remains at large and continues to pose a serious threat.
“Hopefully this reward will encourage more people to come forward and help us track down and catch him.
“We will follow up every potential sighting of him so I’d urge people to call police or Crimestoppers if you think you see him or know of his current whereabouts.
“I would remind people that he is violent and should not be approached.
“We have extra patrols in the city and continue to have officers out looking for him round the clock and we are doing everything we can to find him.”
Leach could be sleeping rough and travelling throughout the country, most likely on public transport.
His appearance is likely to have changed and police believe he may have stubble or may now have grown a beard and look unkempt.
He is white, around 5ft 11in, stocky with cropped hair and hazel eyes. He has a distinctive scar on his top lip under his nose and two distinctive tattoos, one with the name ‘Annette’ on the bicep of his left arm and a figure of a barbarian woman on the back of his right shoulder blade.
He was last seen wearing a black waterproof jacket, dark trousers and carrying a full rucksack.
People with information can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at Crimestoppers-uk.org.
No personal details are taken, information is not traced or recorded and you will not go to court.
The reward only qualifies if the information is passed through the Crimestoppers number.