Missing: Australian man Nathan Hansford, a long-time expatriate resident of Thailand.
Bangkok: Australian businessman Nathan Hansford is the second long-time expatriate resident of Thailand to be declared missing amid concern they may have been targeted by criminals.
Canadian journalist and screenwriter Dave Walker, 58, who has lived in Thailand for more than 20 years, has not been seen since leaving a guest house in the Cambodian town of Siem Reap on February 14.
Mr Hansford’s failure to contact his family since leaving his home in a gated suburb in Bangkok on January 31 has alarmed Australian business people in Bangkok.
The Australian-Thai Chamber of Commerce has appealed for information and posted his photograph on the internet.
Relatives were flying to Bangkok on Tuesday. They are concerned because although Mr Nathan travels regularly, he always kept in contact with family and friends.
His Thai mobile phone has been disconnected and he has not been using emails or social media.
Security guards logged his departure in a taxi from the Bangkok suburb of Thungkru, saying he was travelling to Mo Chit in central Bangkok.
There were anti-government protests in Bangkok that day. But foreigners have not been targeted in the protests and if a foreigner had come to harm it would almost certainly have been noticed and reported to authorities.
Educated at the University of Canberra, Mr Hansford is a debt management specialist who has worked in many developing nations including East Timor and Cambodia. One of his latest contracts was with the Asian Development Bank.
Mr Hansford's wife is from Thailand and he moved to the country from Canberra in 2004.
Australian embassy officials, who handle consular matters for Canadians under an agreement with Ottawa, are investigating Mr Walker’s disappearance after he left the Green Village Angkor guest house in Siem Reap, telling a maid he would return shortly. He left behind his passport, mobile telephone, computer and other belongings.
Mr Walker was working on a movie on the Khmer Rouge, the Cambodian regime responsible for the deaths of an estimated 1.7 million people in the 1970s.
Social media campaigns are under way to try to find both men.