An RAF serviceman from Fife has disappeared after a night out with friends in East Anglia.
Corrie McKeague, 23, who is based at RAF Honington, was last seen in Brentgovel Street in Bury St Edmunds at around 3.20am on Saturday.
The gunner has not been seen or been in contact with anyone since, although CCTV footage appears to show he briefly slept in a doorway before getting up and moving away.
The location of the doorway is several miles from his home.
Suffolk Constabulary released a brief CCTV clip of Mr McKeague on Wednesday night.
The National Police Air Service helicopter has been deployed to help with searches and police have appealed for anyone who may have seen him since, or who may have information about his whereabouts, to come forward.
Police are also asking dog walkers or anyone who may be in the countryside around Bury St Edmunds to get in touch if they notice anything unusual.
Mr McKeague is described as white, 5ft 10in tall, of medium build, with short light brown hair. He was wearing a light pink polo shirt and white jeans at the time he was last seen.
A police spokesman said: “Officers are concerned for his welfare and are asking anyone who may have seen Corrie, or anyone who has any information on his whereabouts, to contact the duty sergeant at Bury St Edmunds on 101.”