China detains US scientist who studied North Korea nuclear tests

Image source, Reuters Image caption, Chen Youlin (right) specialises in using seismological data to track nuclear tests By Kelly Ng Published 1 hour ago China has detained a US seismologist who tracks nuclear tests for nearly two years on espionage charges, his family says. Chen Youlin, 54, was arrested in November 2024 during a personal trip to Beijing to visit family, according to hostage advocacy group Global Reach. Chen has worked on US-funded projects tracking tests in Asia. His published work centres on North Korea, long sanctioned for its nuclear programme. The US has also accused China of conducting secret tests. His wife Rong Yufang, also a seismologist, said the suggestion that Chen was involved in espionage "is both wrong and inconsistent with the public and collaborative nature of the work that he has done". The family had decided to speak out after they saw no sign of Beijing freeing Chen, Rong said through a statement on Global Reach. Chen is currently the only citizen designated as "wrongfully detained" in the US. When asked about the case at a daily press briefing on Tuesday, China's foreign ministry said its "judicial authorities handle cases in accordance with the law". "There is no such thing as so-called wrongful detention," the ministry's spokesman Lin Jian told reporters. In China, espionage convictions can lead to severe penalties such as life imprisonment or death. Born in China, Chen became a US citizens in 2011. He lives in Boston, Massachusetts. He specialises in using seismological data to identify nuclear tests, and has undertaken several projects funded by US authorities. These include a study in December 2020 that looked at seismic data recorded across Asia, including China, to improve methods for nuclear-test monitoring and yield estimation. North Korea is the only country in the region that actively conducts explosive underground nuclear weapon test. However US intelligence suggests that China, too, is developing a new nuclear arsenal – claims that Beijing has denied. Chen's work involved working closely with Chinese colleagues, and Rong says he has always done so "transparently". "He is doing precisely the kind of people-to-people engagement that the Chinese government says it wants," she adds. In an interview with Reuters, Rong also claims Chinese authorities have interrogated her husband more than 100 times on his work and that he wasn't allowed to see a lawyer for first 13 months since his detention. "I have not been able to speak with my husband for over 600 days and am concerned for his health and well-being," she says in the Global Reach statement. According to Global Reach, there are "suspicions within the US government that Chen's arrest was spurred by China's conduct of nuclear tests in violation of the Comprehensive Nuclear Test Ban Treaty". The group says Chen's expertise would give China "an opportunity to learn as much as possible about US seismic detection methodologies so they can establish count