Rafael Grossi, head of the International Atomic Energy Agency (IAEA), said on Friday that the number of attacks on the Russian-controlled Zaporizhzhia nuclear power plant in Ukraine had increased, Russia's TASS state news agency reported.
Grossi was speaking after holding talks in Moscow with Alexei Likhachev, head of Russian nuclear corporation Rosatom.
Russian forces took control of the plant soon after the start of the war with Ukraine in 2022 and Moscow has said the Zaporizhzhia region, which it does not fully control, is now part of Russia, an assertion which Kyiv rejects.
Rosatom said in a statement after the Grossi-Likhachev talks that Ukraine was constantly carrying out attacks on Energodar, the closest town to the nuclear plant.
But Grossi was quoted by TASS as saying that it was impossible to determine which side was carrying out the attacks based on the examination of drone fragments.
"The small fragments of plastic or wood left by the alleged drones do not allow us to speak about the origin of these fragments. However, I would like to assure you that I am raising these issues at the highest level of international discussions," Grossi was cited as saying.
US forces bombed targets in southern Iran overnight after President Donald Trump said Tehran would pay dearly for the deaths of American soldiers, while Iran targeted US sites in Bahrain, Kuwait and Jordan and a tanker was hit in the Strait of Hormuz.
Lebanese President Joseph Aoun will meet US President Donald Trump at the White House on Tuesday to present a plan on how to disarm Hezbollah and secure Israel's withdrawal from Lebanon.
A Russian guided-bomb attack on the southern Ukrainian city of Zaporizhzhia killed at least three people on Tuesday and injured more than a dozen, regional officials said.
An Israeli airstrike on Tuesday killed a father, his wife and their four children in Gaza City, while setting their home ablaze, health officials said.
An earthquake of magnitude 5.0 struck the southwestern Chinese province of Yunnan at a depth of 6 km (3.7 miles) at 7:43 p.m. (11:43 GMT) on Tuesday, the China Earthquake Networks Centre said.