Firefighters worked across the weekend to tackle smouldering roof insulation in the giant protective shelter built over Chernobyl's unit 4 following the drone strike on Friday. Radiation levels in the area remain normal - the original protective shelter inside the giant structure did not suffer any damage.

The U.N.’s International Atomic Energy Agency (IAEA) confirmed Friday that a drone attack damaged an outer wall of the protective dome containing the remains of the damaged Chernobyl nuclear reactor in Ukraine, starting a fire. The 1986 Chernobyl nuclear accident is considered the worst in history.

A drone attack on 14 February caused a fire on the building confining the remains of the reactor destroyed in the 1986 Chernobyl accident. The International Atomic Energy Agency’s (IAEA) Director General Rafael Mariano Grossi called it a deeply concerning incident that underlines the persistent risks to nuclear safety during the military conflict.