The son of an elderly man who has been missing for two days said he is a "homebody" who has been "very upset" following the recent death of his wife.

Thomas Lamb, 79, has not been heard from after he was last seen in Cumbernauld, North Lanarkshire, around 6pm on Saturday.

His son Stephen Lamb issued a statement on Monday, saying his father is "frail" and had never disappeared before. He called for anyone with information to contact police.

Officers have released a CCTV image of the last confirmed sighting of Mr Lamb on Teviot Walk in Cumbernauld town centre.

After speaking to someone outside the Carrick Stone bar and walking through the shopping centre, he was seen seen boarding a Stagecoach X25 bus before getting off on Moss Road.

He may also have been walking along the track at Lime Crescent towards Forrest Road in Abronhill at 6.30pm.

Stephen, 45, said: "Dad is very much a homebody who loves spending time with his family. He is elderly and frail and has been very upset since the passing of my mum.

"This is the first time he has ever disappeared for one night, let alone two, and we are all very concerned about him.

"Dad has lived in the community for over 40 years and has a daily routine of walking up to Abronhill town centre for his paper.

"He is well-known locally and I would ask anyone who may have seen him in the area to please contact Police Scotland on 101."

Inspector Philip Maguire from Cumbernauld Police Office said: "Mr Lamb has now been missing for more than two days without making any contact with his family which is completely out of character.

"He lost his wife very recently and is understandably very upset. His family are all very concerned about his well-being and just want to know he is OK.

"Officers have been carrying out extensive enquiries in the Cumbernauld area and have also visited several public houses in Glasgow City Centre, which Mr Lamb has been known to spend time in.

"However, all attempts to locate him so far have been unsuccessful.

"I would appeal to everyone to look at Mr Lamb's picture and if you think you may have seen him please get in touch.

"Anyone with information regarding his whereabouts is asked to contact officers at Cumbernauld Police Office on 101."

Mr Lamb is around 5ft 8in, with grey hair and a slim build. He walks quite slowly and is believed to have been wearing a black anorak, a multi-coloured jumper with a shirt underneath and blue trousers.