Detectives have released an e-fit likeness of the man who helped a prisoner escape while being transported to hospital.
Andrew Farndon escaped after prison guards were threatened by a gunman as he arrived at West Suffolk Hospital, Bury St Edmunds, from Highpoint Prison on Wednesday night.
The man with the gun is described as white, in his mid-40s, around 5ft 8ins tall, of stocky build, possibly with a Scottish accent and wearing a white top and blue jeans.
Detective Chief Inspector Nick Bennett, who is leading the investigation, said: "We have received a number of calls from members of the public from around the country in relation to the inquiry and we have now identified the witnesses in the CCTV images previously released and been in contact with further witnesses to the incident.
"I would still like to take this opportunity to re-appeal to anyone with information in relation to this incident, particularly the whereabouts of Andrew Farndon, to get in touch immediately.
"We are keeping an open mind as to where he is - he could be anywhere in the United Kingdom. He is a potentially dangerous man and determined efforts are being made by ourselves and forces across the county to trace him and his accomplice."
Police forces nationwide have joined the hunt for Farndon, who made the "planned" escape as he arrived at the hospital's accident and emergency department at 6.50pm on Wednesday.
It is understood the 26-year-old, whose family live in the Coventry area, inflicted a serious knife wound on himself in prison before being taken to the hospital in a taxi. When the jail party arrived, the gunman confronted the male and female prison officials.
The female guard, to whom Farndon was handcuffed, was forced at gunpoint to release him and the two men fled across the car park, Suffolk Police said. It is thought they may have escaped in a dark-coloured car and other accomplices may be involved.
Farndon is described as white with a goatee beard, and was wearing a dark blue baseball cap and a light-coloured jumper which was padded on the right side due to his injury.