Vietnam’s fresh crackdown on “social evils” has resulted in the arrest of six people involved in an online gambling ring reportedly worth $13 million.

The group operated a betting website that was “run by a firm in the Philippines,” according to AFP, quoting reports from Vietnamese police’s official newspaper, Cong An Nhan Dan.

According to the report, the website, which was launched in 2015, allowed gamblers to place bets using cryptocurrencies on football and tennis matches, online casino games and the lottery. Payments are made through bank transfers or ATMs.

“The total amount of transactions from 2015 until now reached more than $13 million,” the report stated.