Two cruise missiles launched by the Russian military flew over the Zaporizhzhia nuclear power plant in southeast Ukraine on Tuesday.

According to Petro Kotin, CEO of Energoatom, the state-owned company that operates Ukraine’s nuclear power plants, low-altitude missile flights “carry great risks.”

“Missiles may hit one or more nuclear facilities, it is a nuclear and radioactive disaster threat to the whole world,” he said.

The Zaporizhzhia atomic power plant is the main power plant in Ukraine and has six reactors (40% of the 15 reactors used in the country). In March, the facility was the scene of clashes between Moscow and Kyiv troops, raising fears of a possible nuclear disaster at rates even greater than Chernobyl.

However, the Zaporizhzhia region was again subjected to air strikes by Russia, which sought to seize southeastern Ukraine to establish a land corridor between annexed Crimea and the separatist Donetsk and Lugansk territories.

At least one person was killed and another injured in the bomb attacks on the city of Zaporizhzhia on Tuesday, according to the regional administration. “Two missiles hit the site of one of the municipal companies. The third exploded in mid-air,” he said in a message posted on Telegram.