The mother of an RAF serviceman who has been missing for almost a month has spoken of her "living hell" in trying to track him down.

In her first national TV interview, Nicola Urquhart pleaded for information on missing 23-year-old Corrie McKeague, of Dunfermline in Fife, who she believes is still alive.

He was last seen after a night out in Bury St Edmunds, Suffolk on Saturday, September 24.

Officers believe he may have tried to walk the ten miles home to RAF Honington.

Nicola's fresh appeal for information comes as police hit a dead end in their investigation.

She told Good Morning Britain: "What would they do if it was their child? This is unbearable. It is a living hell.

"It's been a month and so many people don't know about this - an active serviceman, just disappearing in the middle of the streets."

Corrie's disappearance happened a week before he was due to be paid.

On the night of September 24, he had spoken to his brother four times on the phone arranging for him to visit.

When asked if she thought he may have left voluntarily, Nicola said there was no reasonable explanation.

She said: "I know that would be an easy answer, and I wish it was because then I would think it's been something Corrie has chosen to do.

"There was nothing going on in his life. There was no major event, nothing that might cause him to suddenly think [of leaving] at 3am after he's had a drink, a week before pay day, when he's left his little seven-month old puppy in his room.

"He's been sending photos to friends, he's been in a fantastic mood."

In the four weeks that have passed since Corrie's disappearance, Nicola, a police officer, has played out every possible scenario in her mind.

"There are only three possibilities," she said. "Either he's had an accident by whatever means and he is unfortunately now dead.

"Or he's left voluntarily - but there has been no preparation whatsoever. There has been no motivating factor to make him go, his life is going really well for him at the moment.

"Or he's been taken against his will. I don't want that to sound like I think it has anything to do with terrorism.

"There is one piece of evidence that suggests it's not terrorism and that is nobody has come forward and claimed him - and they would have by now."

Nicola referred to an incident in Marham, Norfolk - 35 miles from the site of Corrie's disappearance - where an RAF serviceman was threatened with a knife in an attempted abduction.

She added: "Police are saying they're not discounting it but it's not an active thing they're looking into right now.

"The police don't know where to search - they've searched the road back to the base and he's not there.

"So if it's been an accident, if someone has taken him to give him a lift up the road - tell us where you dropped him off so we've got some clue as to where to start searching now."

Anyone with information on Corrie McKeague has been urged to call police on 101 or Crimestoppers on 0800 555 111.