A Saskatchewan-wide warrant has been issued for Jason Paul Thorne, a convicted sex offender who police say is at high-risk to reoffend.Police say the 43-year-old man left his home just before midnight on Friday, cutting off an electronic monitoring device.They are searching for him for being unlawfully at large.Thorne is described as 5-9, 170 pounds, with a medium build, brown eyes and black hair.Anybody who sees him is being asked to call police at 306-777-6500 or Crime Stoppers at 1-800-222-8477.