A six-year-old boy drowned in a public swimming pool in Fanling yesterday while at least three lifeguards were on duty. Businessman's son Tam Shek-lun died when his stepmother took him and his two elder sisters, aged seven and eight, to the pool to give them a swimming lesson. They arrived at the Leisure and Cultural Services Department's pool in San Wan Road at about 1pm and then went to play in the children's pool. Later, the boy's stepmother, 35, took them to the secondary pool - 50 by 25 metres in size with a depth ranging from 1.1 metres to 1.4 metres. There were about 50 people at the pool. Shek-lun, a Primary One student, who was not wearing any swimming aids, ran off when his stepmother entered the shallow end of the pool, his sisters said. His stepmother could not find him and sought help from lifeguards. The boy was then found face down in the centre of the pool, a police investigator said. He had lost consciousness and was not breathing. After being given mouth-to-mouth resuscitation by lifeguards, he was taken to North District Hospital, where he was declared dead shortly after 3pm. Police said three lifeguards were positioned at designated posts around the pool. An investigator said one of the lifeguards was 15 to 20 metres away from where the boy was found. Initial investigations showed there were no suspicious circumstances. Shek-lun lived with his father, stepmother and two sisters in Fanling. His father owns a transport company and his stepmother works for a computer firm. A spokeswoman for the Leisure and Cultural Services Department said last night that a lifeguard, who was on duty at the secondary children's pool at 1.50pm, saw a boy struggling in the water. The lifeguard dived into the pool and brought the boy up, while the guards' duty supervisor called for an ambulance. Two other lifeguards applied mouth-to-mouth resuscitation to the boy for about five minutes before ambulancemen arrived at the scene. The boy's pulse was weak when he was taken to Northern District Hospital where he was declared dead at 3.11pm. The incident comes three months after schoolboy Han Kar-kit, 13, attending an Education Department-organised training camp in Tsing Lung Tau, Tsuen Wan, drowned in the camp's swimming pool. In July 1993, 22-year-old duty-free shop salesman Fong Yee-hon, drowned at the busy Kowloon Park swimming pool, where five lifeguards were on duty. A jury later returned a verdict of death by misadventure after a lifeguard said he had watched Fong for 10 seconds before lifting him out of the water because he appeared to be practising holding his breath or diving.