A convicted killer who went missing from a psychiatric hospital four days ago travelled to Edinburgh by train, according to police.
Michael Errington left the Priory Hospital Middleton St George in Darlington at around 8am on Saturday.
He was on approved leave but did not return.
The 51-year-old has been living at the secure mental health hospital in Country Durham for the past nine years after serving 18 years in prison for manslaughter.
Members of the public have been warned not to approach him but to call police on 999.
He is on medication, which officers believe he has not taken since Saturday. He can become aggressive and unpredictable without it, police say.
After leaving the hospital, Mr Errington caught a bus into Darlington town centre.
Once there he caught another bus to Durham and then a further bus to Newcastle, where he boarded a train to Edinburgh.
The service arrived into Edinburgh Waverley station at 2.38pm on Saturday, where he was captured on CCTV getting off the train.
He then left the station via the Princes Street exit and turned left towards the castle.
Temporary Superintendent Catherine Clarke from Durham Constabulary said: “These are our last known sightings of Michael.
“Due to his mental health issues, which can become exacerbated when he hasn’t taken his medication, we believe he may pose a risk to the public.
“Therefore, we would urge anyone who sees him not to approach him but to call us immediately on 999.”
Mr Errington is described as being around 6ft, of medium build, bald, with tattoos on his arms and legs.
He was thought to be wearing a red polo shirt but may have changed into a grey T-shirt. He may also be wearing a black jacket, light blue jeans and white trainers.