Eight people were injured in five separate knife attacks within 24 hours in Macau. The Judiciary Police said the attacks were triad-related and feared that a possible gangland war between two rival gangs had flared up. They said they were investigating the cause of the gangland clashes and were still looking for those involved in the spate of attacks which started on Thursday. Fifteen youths believed to have triad links were being questioned at police headquarters. Police said no charges had yet been preferred against any of the detainees as intensive investigations into the attacks were still being carried out by detectives. At about noon on Thursday, a 43-year-old Fujianese man was leaving his Northern District home with his wife when he was ambushed. Two men armed with beef knives attacked the man and chopped him on his back and hands before fleeing on foot. His wife was unhurt. Detectives recovered a 60-centimetre knife, believed to have been abandoned by an attacker. About 10 hours later in Northern District, six people - including an off-duty policeman - who were dining at a small restaurant were attacked by three men armed with knives. The policeman, 28, who is attached to the Security Police Communications Centre, suffered chop wounds to his head, hands and hips while his two friends, including an Indonesian Chinese, Lee Fung, were seriously injured with chop wounds to the back. The three were taken to the Government Hospital in a serious condition. The third attack occurred at Inner Harbour near the Grand Hotel at about midnight on Thursday when a man in his early 20s was chopped and seriously wounded by four men. He was admitted to hospital in a serious condition. About 90 minutes later in the Outer Harbour area, two brothers were attacked by four youths armed with knives while leaving a video games centre. The brothers, who suffered chop and cut wounds, were also taken to hospital for treatment. The fifth attack occurred at about 5 am yesterday when a teenager suffered minor knife wounds when he was attacked by another youth in a billiard room at Rua do Bispo Medeiros. He was treated in hospital but the injuries were not serious.