An armed drone has hit the protective outer shell of Ukraine's Chernobyl nuclear plant, the site of the worst nuclear accident in history. While the drone's warhead briefly started a fire, radiation levels have not increased,

The outer shell that was struck is a protective cover built in 2016 over a heavy concrete containment structure. Soon after the 1986 disaster, the inner layer (in which there was no indication of a breach on Friday morning), was placed on the plant’s fourth reactor. The containment shells seek to prevent radiation leaks.