Officials have ruled out earthquakes or mining as the source of a 2.75-magnitude event in 2020 near China's nuclear test site ...

Remarks by a top administration official appeared to be aimed at dispelling skepticism of its assertions, as President Donald Trump vows to restart U.S. tests.

A Trump administration official said that a remote seismic station in Kazakhstan measured an “explosion” in western China on ...

State Department alleges China conducted nuclear test in 2020, reigniting debate over U.S. testing moratorium and ...

U.S. releases seismic data alleging a secret 2020 Chinese nuclear test at Lop Nur as global arms control agreements continue ...

A US official says a seismic station in Kazakhstan collected evidence of an alleged China nuclear test at Lop Nur in June 2020.

If nothing replaces the New START nuclear arms treaty, security analysts see a more dangerous environment with a higher risk ...

Did China conduct secret nuclear tests? The United States thinks so. Host Mary Louise Kelly speaks with NPR Pentagon correspondent Tom Bowman and NPR China correspondent Jennifer Pak about China's ...

The United States on Friday accused China of carrying out a secret nuclear test in 2020 as the Trump administration calls for ...

The US accused China Wednesday of conducting at least one secret nuclear test as Washington continued its push for a new arms control treaty that would include Beijing in addition to Moscow and ...

At a event in Washington D.C., A U.S. official said a remote earthquake in 2020 was caused by a Chinese nuclear test.