Air defense batteries fired in several provinces over reports of drones being in the air, state television reported.

State television described all atomic sites in the area as “fully safe.” The United Nations’ nuclear watchdog, the International Atomic Energy Agency, also said “there is no damage to Iran’s nuclear sites” after the incident. Gen. Siavosh Mihandoost, a local army commander, also told state TV the incident caused “no damage” around Isfahan.

Iran then grounded commercial flights in Tehran and across areas of its western and central regions. Loudspeakers informed customers of the incident at Imam Khomeini International Airport in Tehran, online videos purported to show. Iran later restored normal flight service, authorities said.