Israel says it has largely knocked out Iran's air defenses. In contrast, Israel still has strong air defenses in place, though some Iranian missiles are breaking through with lethal results.

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

The State Department raised its travel advisory for Israel to Level 4, the highest level, amid airstrikes from Iran.