On Saturday, residents in Tehran reported hearing explosions, and the Iran air defense fired nonstop rounds in the Pastour neighborhood. Precise casualty figures in Iran were difficult to confirm. But Iran’s U.N. ambassador, Amir Saeid Iravani, told the U.N. Security Council that Israel’s strikes in Iran had killed 78 people and injured 329 others.

National security experts warn that Israel's attack on Iran shows why Chinese land and asset purchases in the U.S. pose a significant threat to American security.

The United States is the main international backer of Israel, Iran's biggest regional foe. It is also a close ally of Sunni Gulf monarchies which for years pursued their own rivalry with the Islamic Republic, seeing it as their main regional threat.

Iran fired a barrage of ballistic missiles at Israel in a counter-strike Friday, after an unprecedented onslaught hammered the Islamic republic’s top military brass and targeted its nuclear facilities and bases.

Wesley Clark. Clark joined “Elizabeth Vargas Reports” in the aftermath of Iranian airstrikes on Israel in response to Israel’s attacks Thursday. “We’re there. We’re ready to do more, if the decision is made and if the opportunity presents itself,

The U.S. did not provide any assistance or have any involvement in the Israeli strike, a U.S. official told ABC News. ABC News' Chief Washington Correspondent Jonathan Karl spoke to President Donald Trump on the phone early Friday morning and asked him about the attack on Iran.

The United States has pulled some diplomatic staff and military families out of the Middle East, citing unspecified regional security risks.

President Trump is trapped between the “America First” isolationists and others in his party who are cheering on Israel’s strikes against Iran.