China detains a U.S. citizen, Min Zin, a Myanmar-focused researcher and think-tank leader, on suspicion of espionage, Chinese officials say. Multiple outlets report that China’s foreign ministry confirmed the arrest and described the allegation as “espionage” and “endangering China’s national security.” Chinese foreign ministry spokesman Lin Jian says the detainee is subject to “criminal compulsory measures,” though details of the allegations and any formal charges are not provided in the reports.

Sources also describe Min Zin’s background. He is identified as the founder or executive director of the Institute for Strategy and Policy of Myanmar (ISP-M) and as a political analyst or researcher who writes about Myanmar and Chinese foreign policy. One outlet adds that Min Zin has a history of student activism in Myanmar’s 1988 uprising.

Other reporting states that he is detained after arriving in southwestern China, with one account placing his entry in Kunming. A think tank associated with him says he was on an academic visit or attending a conference at the time of detention. The reports do not indicate whether China has explained the evidence behind the detention or whether the United States has made an official response.