Aerial attacks between Israel and Iran continued overnight into Monday, marking a fourth day of strikes following Israel's Friday attack. That surprise operation hit at the heart of Iran's nuclear program, striking key facilities and killing several nuclear scientists as well as high-ranking military leaders, according to Israeli officials.

The U.S. did not provide any military assistance or have any involvement in Israel's Friday strike, a U.S. official told ABC News. President Donald Trump told ABC News on Sunday, "It's possible we could get involved."