"TAL Education (NYSE:TAL) discloses that certain employee wrongdoing was discovered in the company's routine internal auditing process. The wrongdoing consisted of the employee conspiring with external vendors to inflate light class sales. Upon the discovery, TAL says it immediately reported the development to the local police and the employee has been taken into custody."
https://seekingalpha.com/news/3559128-tal-educationminus-23-after-fraud-disclosure