KYIV - The International Atomic Energy Agency (IAEA) said Friday that an explosion sounded at the Chernobyl nuclear power plant (NPP) site overnight.

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"The IAEA team at the Chernobyl site heard an explosion coming from the New Safe Confinement, which protects the remains of reactor 4 of the former Chernobyl NPP, causing a fire," the IAEA said on social media platform X.

The IAEA team was informed that an unmanned aerial vehicle had struck the confinement's roof, it said.