Police have said there are "no signs of life" as the search for a missing 73-year-old man is brought to a halt. 

Norfolk Constabulary has "paused" its search for David Ryan who was last seen near his home at Crome Road in Norwich at 10.50am on December 28.

Drone searches, house-to-house enquiries, CCTV footage examination and the distribution of around 22,000 leaflets have taken place over the last few weeks. 

Norwich Evening News: David was last seen leaving his home in NorwichDavid was last seen leaving his home in Norwich (Image: Norfolk Police)

Inspector Terri Cooper-Barnes said: "Hospitals, churches and abandoned buildings have been checked and we have appealed to the public to check outbuildings, sheds and greenhouses.

"Most lines of enquiry have been concluded and given the time period since David went missing, the freezing weather conditions, his age and health, we are very concerned for his welfare at this stage.

READ MORE: Further details of A&E trip of man involved in Costessey tragedy emerge

"There continues to be no signs of life."

She added that although enquiries would be continuing, searches for David were being "paused" until further information is available. 

David is known to walk around Norwich city centre, Magdalen Street, Anglia Square, Silver Road and Chapelfield Gardens.

A statement released by David's family on January 12 said : "We are concerned for David’s welfare, he is someone who tends to stick to the same places in Norwich and it would be unusual for him to travel outside the county.

"His clothing is fairly distinctive and would appeal to anyone who may have seen him to get in touch."

David is described as white, 5ft 3ins, and is believed to be wearing a black bobble hat, a long green or dark-coloured wax jacket, dark trousers, and work-style boots.

He has shoulder-length white or silver hair.

Anyone with information or who knows of his whereabouts can contact Norfolk Constabulary on 101 quoting incident number 180 of January 1.