The World Health Organization is preparing for the possibility of a nuclear incident as tensions rise in the ongoing conflict involving Iran, with officials warning of severe and lasting global consequences.

WHO Eastern Mediterranean regional director Hanan Balkhy said U.N. staff are closely monitoring the fallout from strikes on Iran’s nuclear sites and are preparing for a range of potential nuclear-related emergencies. She described a nuclear incident as the most concerning outcome if the conflict continues to escalate.

Balkhy said the agency is considering scenarios including damage to nuclear facilities or the potential use of nuclear weapons, and is reviewing response protocols for staff in affected regions. She warned that the consequences of such an event could extend far beyond the immediate area and last for decades.

Concerns come after Iran informed the International Atomic Energy Agency that a projectile struck the premises of the Bushehr nuclear power plant. The IAEA said there was no reported damage to the facility or injuries to personnel.

The agency has also reported damage to buildings at the Natanz enrichment site and to facilities near the Isfahan nuclear complex during the course of the conflict.

Officials say the situation remains fluid as international organizations continue to monitor developments and assess risks tied to nuclear infrastructure in the region.