AstraZeneca said on Wednesday its China president Leon Wang had been detained by Chinese authorities and, although it did not know the reason, it did not believe it was linked to a large health insurance fraud case involving the company.

Two current and two former senior AstraZeneca Plc executives in the group’s China unit are under investigation in a probe into alleged breaches of laws around drug importation and data privacy, the company said.

Pharmaceutical giant AstraZeneca said Thursday that the head of its China operations had been detained, after reports the firm was under investigation for potentially illegal data collection and drug imports.