China said Friday it was holding an American citizen accused of espionage, identifying the man as a political analyst at a policy think tank focusing on neighbouring Myanmar.

Min Zin — a founder of the Institute for Strategy and Policy Myanmar (ISP-M) — “has been subjected to criminal compulsory measures”, Chinese foreign ministry spokesman Lin Jian told a news briefing.

Authorities are holding him “on suspicion of engaging in espionage activities that endanger China’s national security”, he said, without providing further details.

The ISP-M researches the political, resource and conflict dynamics of Myanmar, which was plunged into civil war by a 2021 coup.

Some of their publications detail China’s influence in the borderlands of Myanmar, where Beijing is accused of supporting armed factions which suit its national interests.

It is not clear whether Min Zin was conducting research at the time he was held by Chinese authorities.

A person with professional ties to ISP-M, who spoke on condition of anonymity because of the sensitivity of the case, told AFP Min Zin was arrested on June 3 at Kunming airport in Yunnan province, which borders Myanmar.

“He went there to attend a meeting,” said another person with a close relationship to the detained academic, who also spoke on condition of anonymity.

Chinese authorities said the US consulate in Guangzhou had been notified of the case.

“His family and colleagues are following up with the consulate office there,” the second source said. “I know his family is worried.”

Neither the US State Department nor the ISP-M have responded to a request for comment.

The ISP-M is based in the northern Thai city of Chiang Mai, a hub for political exiles from Myanmar since the coup ousted the democratically elected government of Aung San Suu Kyi.

Analysts, including those at the ISP-M, say China has intermittently backed both the military and rebels in the civil war according to its varying economic and security interests.