Police are hunting for the relatives of a mentally and physically handicapped man who was dumped in Tin Shui Wai. It is the fifth such case in the New Territories in the past four months, but the first involving an adult. The other cases involved mentally handicapped children aged between seven and 14. Like the previous cases, the wheelchair-bound man, who was abandoned on Friday morning, has communication problems and was not carrying an identity document. 'He is physically and mentally handicapped. He is unable to speak and give his identity,' one officer said yesterday. The man, thought to be aged about 40, was seen getting out of a taxi at the Lau Fau Shan Road roundabout with the help of another male passenger at 5.30am on Friday. He was left on the pavement in a wheelchair. The other passenger left in the same cab heading towards Lau Fau Shan. A passer-by noticed the handicapped man and called police. The man is thin and was wearing a blue and white striped sweater, a black coat and grey trousers when he was found. He has been taken to Tuen Mun Hospital, where he will have a check-up. Police inquiries revealed the taxi picked up the two men in Nim Wan, Tuen Mun. Officers said they would talk to other government departments to find out whether the man is a Hong Kong resident. A 10-year-old boy was discovered in Tin Shui Wai on October 15, while a wheelchair-bound boy and girl aged 12 and 14 were found together in Tai Po on December 17. A seven-year-old boy with a mental age of three was found in Yuen Long on December 31. A police source has said that the four children may have been dumped by mainland relatives who thought they would be better cared for in Hong Kong. Anyone with information on the latest incident should contact officers on 2448 5205.