China has broken up two major online gambling rings, including one that utilized trademarks associated with legitimate Macau casino operators.

On Sunday, state-run media outlet Xinhua reported that police in Jiangsu province had arrested over 50 suspects connected to a “transnational” online gambling ring that handled turnover of around RMB7.8b (US$1.1b) in the past two years from around 114k customers, netting the ringleaders some RMB650m in profit.

Police said the Philippines-based gambling site – which operated under the Diyi (Emperor) Entertainment brand – first appeared on their radar in January 2016 following a tipoff from an irate customer. Sina.com repored that the customer, who’d lost over RMB150k ($21,900) in one week, had been introduced to the site by a friend in an internet café at a local shopping mall.

Police subsequently determined that the site’s average daily turnover was around RMB10m, while the ring relied on a network of 27 agents, who in turn utilized around 5,700 sub-agents to recruit customers and enable money movement. The scale of the operation was sufficiently vast that the feared Ministry of Public Security took over coordiantion of the investigation.