Police hunting for a prisoner who escaped from a G4S van are focusing their search efforts in Lanarkshire.

Anthony Ferrie absconded after knocking out a custody guard and injuring another guard's arm during a visit to St John's Hospital in Livingston at 1pm on Thursday.

Ferrie, who is serving time at Addiewell Prison for housebreaking, then escaped from the hospital grounds sparking a major search involving a police helicopter.

On Friday, police said they were concentrating their efforts to track down the 33-year-old in the west of Scotland.

Detective inspector Paul Batten, based at Livingston, said: "Ferrie is from Bellshill and whilst we are carrying out some enquiries in West Lothian, most of our work is happening in Lanarkshire.

"The investigation is using both local and national Police Scotland resources, and liaison with partners, to try to locate Ferrie as quickly as possible and return him to custody.

"I would urge anyone who may know of his whereabouts to contact police immediately."

Police urged members of the public not to approach Ferrie and instead call Police Scotland on 101.