A dispute between unauthorized online gambling operators in Taiwan has led to the deaths of four individuals, according to local media reports.

Last week, the Taipei Times reported that two men and one woman had died of “execution-style” gunshot wounds to the head at an office building in Taoyuan’s Jhongli District on June 22. A third man, Chang Chun-hao, the alleged culprit behind the killings, died of a self-inflicted gunshot wound to the head after being cornered by police while trying to flee the scene of the crime.

According to the report, Chang ran a profitable but highly illegal online sports betting operation from his residence and a private office. Police found a total of 15 computers at the two locations, and believed Chang was netting between NTD3m-5m (US $98k-164k) per month from thousands of betting clients.

In March, around 1k of Chang’s clients reportedly defected to a rival online betting outfit run by two of the shooting victims. Rumors had circulated that Chang’s operation was in financial difficulties and Chang suspected that the rival operation was the source of these rumors.