Mark Bushnell search: Possible sighting at Durham caravan park
An unconfirmed sighting of a missing boarding school deputy head has been made at a County Durham caravan park, police said.
Mark Bushnell, 50, was last seen at about 11:30 GMT on Sunday, when he left his home in Durham City.
His car was later found at a clifftop car park at Blackhall, near Peterlee.
Durham Police said a member of the public reported seeing a man fitting Mr Bushnell's description at about 08:00 GMT on Monday at Crimdon Caravan Park.
The caravan park has been searched and residents spoken to, but Mr Bushnell is yet to be located, said Durham Police.
Ch Insp Andy Huddleston said: "This is a new possible sighting of Mark and although unconfirmed, we are treating it seriously.
"We have informed Mark's family of this sighting and are continuing to follow a number of lines of inquiry."
Specialist teams are concentrating their searches from Crimdon Caravan Park towards the stables at Crimdon Dene, police said.
The married father-of-three, who is 5ft 10in tall, slim, with closely shaved grey hair, was possibly wearing a checked shirt and brown or blue jeans.
Mr Bushnell was appointed Durham School's deputy head in charge of pastoral care in July 2012.