The munitions, named by a government official as GBU-72 Advanced 5k Penetrator bombs, were first released in 2021.

During the Cold War, scientists developed a controversial nuclear weapon designed to change how nuclear warfare worked. The neutron bomb minimized blast damage while maximizing lethal neutron ...

When Iran’s covert nuclear program came to international attention over two decades ago, Tehran insisted that its intentions were peaceful and that it had no plans to develop nuclear weapons.

Iran is extremely unlikely to produce functional nuclear bombs in the current environment—and certainly not quickly. The disruptions from Israeli and U.S. operations (including the ongoing strikes), ...