Cracks have appeared in a concrete dome holding 120,000 tonnes of contaminated soil and debris from Cold War-era nuclear bomb tests.

In 1954, the United States detonated Castle Bravo at Bikini Atoll expecting a far smaller blast, but the explosion came out vastly stronger than planned and became the largest nuclear test in U.S.

On Runit Island in the Marshall Islands, a concrete lid sits low against the Pacific, close enough to the tide line that the ...

A senior US official on Tuesday revealed what he said were new details of an underground nuclear test blast that China allegedly conducted in June 2020. Assistant Secretary of State Christopher Yeaw ...

The US tested a doomsday ballistic missile off the California coast Tuesday night — as war raged in the Middle East. The ...

As major powers renew their focus on nuclear testing, the world may be entering a new nuclear era. Accusations that Beijing has conducted secret nuclear tests should trigger greater focus on China’s ...

A senior U.S. official offered new details Tuesday night about an alleged nuclear bomb test conducted by China in June 2020. Assistant Secretary of State Christopher Yeaw spoke at a Hudson Institute ...

A senior United States official on Tuesday disclosed further details about a covert nuclear-related test allegedly carried out by China while stressing the U.S. cannot afford not to resume testing to ...

GENEVA (AP) — A U.S. official focusing on arms control on Monday provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago and urged countries to ...

The U.S. Air Force carried out a major intercontinental ballistic missile test on March ...