MULTIPLE wounds on a murder suspect who died after four hours of questioning by police might have been self-inflicted as part of a supernatural ritual, officers said yesterday. Police are investigating the death of Lam Tin-ming, 56, who was a follower of sundar - a belief that attacks can be sustained without injury after a god is invited to enter the body. Fung shui expert Koon Lung said some followers would invite a supernatural force into their body and then try to knife themselves. Mr Lung said that sometimes sundar practitioners inflicted wounds on themselves which did not appear until after death. A postmortem examination found Lam had sustained multiple broken ribs, a torn liver, bruising to his feet and chest and internal bruising. While doctors believed some of the injuries could be a result of attempts at resuscitation, the cause of the others remain a mystery. It is understood a pathologist found the injuries were inflicted between 18 to 48 hours before Lam was pronounced dead at 4.26 am on November 22 last year, meaning the injuries could have been inflicted before his arrest. Sources said Lam was first intercepted by the police at about 3.30 pm on November 21. He was taken back to his home and then back to the police station around midnight. Both a government and an independent British pathologist found that Lam's injuries were not a result of assault and were not related to his death. They also concluded that Lam, being questioned over two murders in which the elderly victims were strangled and robbed, died of a heart attack. New Territories North Senior Superintendent (Crime) Martin Cowley said: 'There are some injuries on his body which mean we can't exclude the possibility that they are self-inflicted. 'If we are to follow the logic that Lam was a sundar practitioner, some of the injuries may have been inflicted while he was practising sundar. '