Koh Kian Tiong received bribes from an operator of illegal gambling dens in the form of money and entertainment at KTVs. SINGAPORE: In exchange for money and entertainment, a police officer leading a team against unlicensed money lending gave the operator of illegal gambling dens tip-offs on police operations. Koh Kian Tiong, who also goes by Mark Koh, was an Assistant Superintendent with the Singapore Police Force (SPF) at the time. After learning about the investigations into his offences,