Family of British trekker on his disappearance in Nepal
19 August 2012 Last updated at 10:57 BST
Tourists are being banned from trekking alone in parts of Nepal following reports of a number of foreign travellers going missing.
Among them is British trekker Zisimos Alexander Souflas. He was due to arrive back in the UK four months ago.
However when his mother went to the airport to pick him up he wasn't there.
His sister Sophie Souflas and cousin Andrew Dawson say despite a search, no trace of the 27-year-old has been found.