Some observers fear scenarios such as the theft of nuclear weapons by terrorists, the ascension of religious extremists in Islamabad, or the proliferation of weapons by radical sympathizers within ...

The development of a nuclear bomb that would be 24 times more powerful than the one dropped on Hiroshima, Japan, during World War II is "significantly ahead of schedule," according to U.S ...

A hydrogen bomb—thermonuclear by design—that doesn’t require uranium or plutonium; such a weapon of mass destruction could ...

A POWERFUL nuclear weapon that's 24 times stronger than the bomb that killed hundreds of thousands of people at Hiroshima is underway. The United States has ramped up production of the bone ...

has threatened to attack Iran unless it reaches a new deal swiftly that would prevent it from developing a nuclear weapon. Iran, which says its nuclear program is peaceful, says it is willing to ...