Iran's nuclear sites have not been damaged by Israel's strike on Iran early Friday morning, according to the International Atomic Energy Agency (IAEA).

In a statement released on social media, IAEA chief Rafael Grossi says he "continues to call for extreme restraint from everybody and reiterates that nuclear facilities should never be a target in military conflicts."

After suspending flights at several airports following reports of an explosion in Iran, Iranian state media said early Friday normal operations have resumed.

-ABC News' Will Gretsky

Flights to Tehran, Isfahan and Shiraz have been suspended following reports an explosion was heard in the city of Qahjavaristan, Iranian state media reported.

The city of Qahjavaristan is located near Isfahan Airport and the 8th Shekhari Base of the Army Air Force in the northwest of Isfahan.

-ABC News' Will Gretsky

A U.S. official confirmed to ABC News Israeli missiles have hit a site in Iran. The official could not confirm whether Syria and Iraq sites were hit as well.
-ABC News' Martha Raddatz

White House National Security Council spokesman John Kirby told ABC's "Good Morning America" Sunday that any response to Iran's Saturday night attack is up to Israeli forces.

But Kirby stressed that President Joe Biden does not want the situation to escalate or have the U.S. drawn further into any conflict.

When asked by ABC News' Whit Johnson about a response from Israel, Kirby said that it is up to the Israeli government to decide how to respond. He added that "the damage was extremely light," and the defenses in place proved Israel can defend itself.

"I won't speak for the Israelis. It's going to be up to them to decide whether and how they'll respond to this," Kirby said. "They showed last night, an incredible military capability on their own, but certainly in concert with friends."

When pressed about reports that Biden told Israeli Prime Minister Benjamin Netanyahu the U.S. would oppose a counterattack on Iran, Kirby said it was "not an accurate reading" of the president's message. He emphasized that the White House does not "want to see the situation escalate further."

"The president understands the prime minister runs a government for a sovereign state of Israel, and that they'll decide whether and how they're going to respond to what Iran did last night," Kirby said.

Kirby reiterated the White House's message that the president will do "whatever he has to protect our troops and our facilities, our people in the region." He said there is no current threat to U.S. service members and facilities, noting that more U.S. forces moved into the region after Oct. 7 to help defend Israel and shipping channels in the Red Sea.

"We're going to obviously be vigilant to any potential threat to our forces in the region," Kirby said. "But the president has been clear we are not looking for a wider war. We're not looking for a second front or a third front. We're not looking to see escalation and we're certainly not looking for a war with Iran."

Kirby added that good intelligence about the attack helped the U.S. and Israel prepare.

"We've been watching as closely as we could the intelligence picture, we had a pretty good indication of the size and the scale and the scope of what Iran was planning," Kirby said. "That is why, because we had a good sense of what they were going to do and with how much, we were able to really help Israel knock down almost everything that Iran threw at them."