Authorities in South Korea have busted an illegal online gambling operator as well as a group of high school hackers who blackmailed other online gambling sites.

On Friday, the Ulsan Regional Police Agency arrested a 31-year-old man on suspicion of running an illegal online betting site taking wagers on horse and dog races. Police also arrested a 21-year-old accomplice accused of promoting the site on social media.

Police said the site, which ran off a Singapore-based server, had been in operation since February 2014. During its two years of operation, the site is believed to have handled wagers of at least KRW 900m (US $782k) on racing events in Japan, Macau and South Africa, from which the operator took a commission of 2% to 5%.

MORE KOREAN-ON-KOREAN DIGITAL VIOLENCE