HANOI, Vietnam: Vietnamese police said Tuesday (Jul 7) they had arrested 85 people linked to two "exceptionally large-scale" betting rings worth a combined US$133 million, as the government cracks down on illegal gambling during the World Cup.Online gambling is banned in the communist country, but lucrative illegal operations abound prompting periodic clampdowns especially during international sporting events.The raids in late June targeted two rings with an "exceptionally large scale of operation" and a "high level of hierarchy and tight control", police in Ho Chi Minh City said in a statement.Since October, the rings had logged an estimated US$133 million in illegal transactions, the statement said. Leaders of the rings confessed to receiving "master-level betting accounts from individua