A convicted rapist has gone on the run during a planned visit to a monastery, sparking a police warning of the potential risk to members of the public.
Malcolm Millman, aged 58, was last seen at Manchester Airport.
Millman was on a day visit to a monastery at St Margarets in Great Gaddesden, near Hemel Hempstead, on Saturday but never returned to the medium-security Chadwick Lodge care facility in Milton Keynes as he should.
Police have warned that due to his previous convictions, which include rape, he could pose a risk to the public.
Millman was convicted of rape in 1996 and had been due to serve 12 years, but was transferred to Chadwick Lodge, which looks after people detained under the Mental Health Act.
He is white and bald with thinning brown hair at the sides, has brown eyes and was carrying a walking stick. He was wearing a brown jacket, purple jumper, grey tracksuit bottoms and blue and white trainers.
He has been known to use other names including Richard Simon Barber, Michael Geoffrey Newman and Raymond Pilkington.
Supt Olly Wright said officers believe Millman took a train from Hemel Hempstead to London, before travelling to Leeds. He was last seen on CCTV at Manchester Airport at 1pm on Monday - though detectives do not believe he has access to a passport.
He urged witnesses or anyone with any information on Millman's whereabouts are urged to call Thames Valley Police on 101 or Crimestoppers on 0800 555111.