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 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 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.

Iranian state media report more explosions, with blasts heard in Tehran, as Israel says its air force is hitting military targets.

Blasts rang out across a swath of the Middle Eastern republic’s territory, targeting its nuclear capabilities, military leadership and scientists.

Israel's widespread airstrikes against Iran's nuclear program are stoking fears of a larger confrontation.

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