Bo Wang’s return to China on Saturday marked a crucial step in the investigation of an online gambling ring that attracts bettors in China. Police said they have already arrested 125 people and seized more than $12.9 million in connection with the case.

Police in China arrested 125 people in Heilongjiang province, bringing the axe down on a cross-border online gambling network that involves a company based in the Philippines.

On Saturday, authorities escorted Bo Wang, the main suspect in the case, from the Philippines to Harbin City in the Heilongjiang province. According government website China Police Daily, Wang’s return in the country marked a crucial step in the police investigation.

In addition to the arrests, police have also seized more than $12.9 million (80 million yuan) in gambling funds and frozen bank accounts with funds amounting to $37.03 million (230 million yuan).