Police have busted a cross-border gambling syndicate and arrested 71 people on either side of the border.
Records of bets worth around HK$108 million were also found in a joint operation by Hong Kong police and their mainland counterparts.
Two of the 23 held in Hong Kong are suspected of masterminding the syndicate, which took bets on horse racing and football matches across the world.
Chief Inspector Lo Chung-wong from the Organised Crime and Triad Bureau said the masterminds acted as "senior brokers" and received bets from gamblers or brokers.
Detectives said the gang was busted after six months of investigation.