Family and friends of a missing Sussex student held a march of support as the search for him continues.
Eddie Gibson, 20, was last heard from in Cambodia on October 24 last year when he emailed his mother to say he was due to fly home.
His family fears he may have fallen foul of armed gangs in the capital, Phnom Penh.
More than 100 people walked from Devil's Dyke, near Brighton, in a show of solidarity for the Gibsons.
The area is where Eddie and his brothers went on sponsored walks while at St Christopher's School, Hove.
His mother, Jo Gibson-Clarke, said: "It's just fantastic to have all these people who just want to show their support for us and the rest of the family."
Eddie's email said he would be flying back to the UK on November 1 but he never arrived.
He had travelled to Cambodia with £3,000 in cash and his father, Mike Gibson, said he could have been robbed "with serious consequences".
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