The IAEA has also requested access to the inside of the building - noting that it is located immediately next to reactor unit 6 - for further examination. During the walk down, the team was told to shelter after hearing the sound of drones nearby and gunfire to repel them. The team was still able to confirm with their measuring equipment that radiation levels at the site remain normal. Rafael Grossi says yesterday's strike was a serious incident that endangered key nuclear safety principles.