The casino cash stolen over the holidays from South Korean operator Landing International Development was the work of more than just a single employee, according to local police. 

Earlier this week, the Hong Kong-listed Landing confessed to investors that an employee had apparently made off with over KRW14.5b (US$13.4m) in cash from Jeju Shinhwa World, the company’s gaming venue on South Korea’s Jeju Island. 

The Yonhap news agency reported Thursday that Landing had asked police to track down a female Malaysian employee the company suspects of being behind the heist. The unidentified staffer apparently didn’t return to her post after the holidays and her whereabouts are currently a mystery.

The staffer apparently wiped the casino’s security footage before she fled the scene, leaving police without any hard proof of her involvement in the theft. But police are working on the theory that she had at least two accomplices, both of whom presumably possess strong backs.