Updated at 5.28pm: A Hong Kong man was arrested in Macau for allegedly running an illegal soccer gambling ring, police in the enclave have confirmed on Monday. Officers arrested the man, who was not identified, in a residential unit on the island of Taipa and seized betting slips valued at $10 million. Macau police said the gambling syndicate was controlled by a triad gang and took bets from Hong Kong by telephone. It had been in operation for about a month. Some ring members were still at large, Macau police said. Monday's action by Macau police was part of a joint effort with their Hong Kong and Guangdong counterparts to combat an anticipated rise in illegal soccer gambling during the World Cup. In similar raids last week, Macau police arrested 16 Hong Kong and Macau people and confiscated more than $100 million in betting slips. Legal soccer gambling was introduced in Hong Kong in 2003. But illegal bookmakers remain more attractive to many punters in the territory with its better odds and types of bets offered. Hong Kong and Macau police said they have teamed up with forces in Southeast Asia and China to stamp out illegal soccer gambling rings.