Friends have put posters about Danny Hall on websites
A reward is being offered for information about a Norwich man missing in Thailand who was believed to be on a six month touring holiday in Asia.
Danny Hall, 35, has not been seen since leaving an all night beach party on the island of Koh Pha Ngan on 24 February.
Friends, who have put up £500 in reward money, said his belongings were all left in his room and they were becoming increasingly worried about him.
They have placed appeals about Mr Hall on a number of websites.
Danny Hall was seen leaving the Full Moon Party on the beach at Koh Pha Ngan at about 0430 local time (2230 BST) according to information posted on the internet by his friends.
The Foreign Office has confirmed that police in the UK and Thailand are investigating.
A spokesman said Danny Hall's family and friends were very concerned for his well-being as his disappearance was completely out of character.
Norfolk police say they are making a number of inquiries in Norfolk and they are liaising with Interpol.