Follow the latest news after Israel launched strikes at Iran, a dramatic escalation in long-running tensions between the two countries.

The Israeli military targeted Iranian nuclear facilities, research scientists and senior military commanders in dozens of preemptive airstrikes​.

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.

Shortly before sunrise in Iran on Friday, Israel launched the first strikes of its operation against the regime’s nuclear program.

The retaliatory strikes came after Israel attacked Iran, killing top military leaders and scientists. The assault destroyed an aboveground nuclear enrichment plant near Natanz, the head of the U.N. nuclear watchdog agency said.

Mossad released footage that it said showed two agents on Iranian soil who deployed precision attack systems "designed to destroy Iranian air defense systems."

Before Israel launched a wave of strikes against Iran’s nuclear facilities and top military leaders this week, its spies were already on the ground in enemy territory.

The Dow dropped more than 750 points Friday as investors fret over the risk of a widening war in the Middle East.

President Trump joked that Iranian officials killed in Israel's airstrike clearly did not die of an illness, warning that Iran should have heeded his warning.

Israel badly damaged one of Iran’s key nuclear sites and killed a startling array of top military and nuclear officials in the attacks that started on Friday morning. But when the sun rose after that devastating assault, it was also clear how much of Iran’s nuclear program remained, at least for now.

Iran has retaliated against Israeli strikes with ballistic missiles in Jerusalem and Tel Aviv. Rep. Eugene Vindman, member of the House Armed Services Committee, joins The Weeknight to break down the escalating violence in the Middle East,

The back-and-forth strikes stoked concern among investors about a possible wider conflict across the Middle East, which accounts for a large share of global oil production. The U.S. West Texas Intermediate futures price -- a key measure of U.