"Seek immediate shelter. This is not a drill," the warning ... The best course of action is simply to avert your eyes. When a nuclear bomb strikes, it sets off a flash of light and a giant orange ...

"The elevated global threat level increases the risk that nuclear weapons may be used," Swedish authorities said in updated guidance late last year.

A bomb shelter built in the basement of a new volunteer rescue depot building in Võru County is the first of its kind in Estonia and built to Finnish standards, with ventilation, water and electricity ...

The lab designing the warhead says it is accelerating the timeline to respond ‘to a critical challenge and urgent need.’ ...