Ukraine’s nuclear ghosts have been stirred up again after a drone armed with a warhead hit the protective outer shell of the plant at Chernobyl, the site of the world’s worst nuclear accident. The strike on Friday did not breach the plant’s inner containment shell and radiation levels did not increase.

President Volodymyr Zelensky of Ukraine called the damage “significant” but said there were no signs of radiation leaks. A Kremlin spokesman denied that Russia had carried out the strike.

A Russian drone struck the former nuclear power plant at Chernobyl in an attack overnight into Friday, Ukrainian President Volodymyr Zelensky has said.

A drone armed with a warhead hit the outer shell of Ukraine’s Chernobyl nuclear plant, briefly starting a fire, in an attack Kyiv blamed on Russia.

The strike set fire to the shelter that contains radiation from the site of the largest nuclear disaster in history, according to Ukrainian officials.

A Russian drone attack badly damaged the confinement structure around the disused Chornobyl nuclear power plant intended to prevent the release of nuclear substances, a senior nuclear industry official said on Friday.

Ukrainian President Volodymyr Zelenskyy said a Russian drone struck the protective covering of the nuclear reactor that exploded at Chernobyl in 1986.