About 80 volunteers have joined a police search for a 69-year-old man missing from his home at Blackboys near Uckfield.
Bruce Coleman, who lives on his own in a caravan in Nursery Lane was reported missing on Thursday by neighbours who were concerned they hadn't seen him for some days.
Mr Coleman is white, of stocky build with thinning, receding hair and has a beard. He may be wearing a blue crew neck jumper and dark trousers. A picture of him can be seen on the Sussex Police website.
Detective Inspector Rob Morland said: “Mr Coleman lives in a rural location and is a bit of a 'loner', but is normally seen quite regularly by his neighbours who are rightly concerned for him.
“We have checked with family members, local hospitals and other locations where he might have gone and on Saturday a South East Air Support Unit helicopter was deployed to search woodland and fields in the area.
“Police officers have now been joined by Lowland Search Dogs and more than 80 volunteer searchers recruited through Neighbourhood Watch.
“We are increasingly concerned for Mr Coleman's welfare, particularly as the weather has turned colder.”
Anyone who sees him is asked to call Sussex Police on 101 quoting serial 852 of 10/11.
If he is in danger or in need of medical attention, please call 999 immediately.