Authorities in Hong Kong and mainland China have rumbled yet another massive cross-border illegal online gambling operation.

On Monday, China’s official state media agency Xinhua announced the arrests on Sunday of 71 individuals suspected of involvement in a major online gambling ring that involved illegal wagering by mainland gamblers on Hong Kong’s legal gambling industry.

Police in the Chinese province of Guangdong reportedly received a tip in April regarding websites that allowed mainland punters to place bets on international football matches, as well as horseracing put on by the Hong Kong Jockey Club (HKJC).

On Sunday, hundreds of police carried out simultaneous raids on dozens of locations in both jurisdictions, leading to the arrests of 48 individuals in Guangdong and a further 23 suspects in Hong Kong.