MOSCOW - Russia's Rosatom said on Saturday that a Ukrainian drone had struck the Zaporizhzhia nuclear plant, but no damage to key equipment was reported.

The Ukrainian drone struck the turbine island of Unit 6 of the power plant and exploded earlier on Saturday. The International Atomic Energy Agency has since been notified of the attack.

"Such strikes on nuclear facilities are extremely irresponsible and pose grave threats to nuclear security. Any attack on a nuclear plant's infrastructure may trigger unpredictable consequences and endanger regional safety," the plant stated on its social media account, adding that there were no casualties or serious damage.

Rosatom CEO Alexey Likhachev said this was the first targeted strike against a nuclear plant's key equipment that caused a blast and inflicted damage on the turbine island structure.

The drone was controlled via fiber-optic links, ruling out any chance of an accidental strike, the Rosatom chief added.