KYIV, Ukraine: The head of the United Nations’ atomic agency says that it was a training center at a Ukrainian nuclear plant that was hit by a Russian “projectile.”

Earlier reports conflicted over what part of the plant was affected by fire that broke out after shelling. Nuclear plant spokesman Andriy Tuz told Ukrainian television overnight that shells fell directly on the facility, and set fire to reactor that is not operating and to an administrative training building.

International Atomic Energy Agency Director-General Rafael Mariano Grossi said Friday that the building hit was a training center and “not part of the reactor.”