Asian nations are ramping up their crackdowns of illegal gambling activity ahead of this summer’s FIFA World Cup betting bonanza.

This week, authorities in Vietnam’s Vinh Phuc province announced the filing of charges against 22 individuals for their association with a betting ring that processed wagers online via the password-protected betting site 3in1bet.com. Six individuals were taken into custody, including the alleged ringleader, Luu Van Nam.

Police said their investigation concluded that the ring had handled wagers worth VND200b (US$8.7m) in the last half of 2017 alone. During their raids, police seized 21 mobile phones, three computers and around VND400m in cash.

The bust follows the much larger bust of a major online gambling operation with ties to the nation’s former top cybercrime cop and a pair of highly successful technology businessmen.