Senior U.S. official Christopher Yeaw revealed new details of an alleged underground nuclear test by China near Lop Nor in June 2020, citing seismic data from a Kazakhstan station showing an explosion of magnitude 2.75. Yeaw, a former intelligence analyst, stated the data was inconsistent with mining or earthquakes, pointing instead to a nuclear detonation. However, the Comprehensive Test Ban Treaty Organization (CTBTO) stated the seismic events were too small (below 551 tons of TNT equivalent) to confirm a nuclear test with confidence, leaving the claim unresolved.