A Buddhist ritual was held at Tung Lam Monastery in Tsuen Wan yesterday to appease the souls of the two monks hacked to death in its dormitory last week. The 45-minute ceremony was attended by about 100 monks and worshippers at the main hall of the Fu Yung Shan Road monastery as detectives continued their investigation into the murders of Sik Kuo Chung, 84, and Sik Tai Wan, 53. Hundreds of birds were freed from 14 cages to pacify the souls of the two monks during the ritual, which began at about 12.30pm. At 3pm, six plainclothes officers returned to the monastery and conducted a search inside and outside the dormitory to look for additional clues. The younger victim was killed in the bathroom while the other was attacked and killed outside between 12am and 2am last Saturday. Two bloodstained knives and a pickaxe were found at the scene. Detectives have ruled out the possibility that the two monks attacked each other. They believe the younger victim was the main target and the older monk was killed after he discovered the murder. On Thursday night a monk and a Buddhist devotee were invited to the offices of New Territories South regional crime unit in Ma On Shan to help investigating officers. A police spokeswoman said the two men were released unconditionally. No one has been arrested in connection with the case. The move comes after police took statements, fingerprints and DNA samples from monks, staff and workers at the monastery.