Taiwanese authorities have detained three current and former employees of the world’s largest chip manufacturer, Taiwan Semiconductor Manufacturing Company (TSMC), for allegedly stealing trade secrets,

Taiwan Semiconductor Manufacturing Company said Tuesday it had discovered “unauthorized activities” of employees suspecting of stealing trade secrets related to its advanced computer chips.

The three were detained late last month after TSMC reported that an internal investigation had shown that former and current employees had illegally obtained information from the company, the Taiwan High Prosecutors Office said in a statement. The prosecutors office said another two people had been released on bail, and one more had been released.