NBC News' Matt Bradley reports from Israel where sirens rang out across Tel Aviv after missiles were reportedly launched from Iran. The order for residents to take cover was lifted about 15 minutes later.

Truckloads of aid are on their way to the city of Bat Yam, south of Tel Aviv — where at least nine Israelis were killed by a missile strike on Sunday — as well as Haifa and other communities targeted by Iran’s ferocious missile barrage over the past four days.

In Lebanon, which is still reeling from last year’s war between Israel and the Hezbollah militant group, videos making the rounds on social media have shown revelers dancing and drinking on rooftops while projectiles flash across the sky in the background.

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.

Onlookers gathered on Saturday at a central Tel Aviv residential building next door to Israel’s defense headquarters that was damaged after it took a hit from what appeared to be shrapnel from an overnight missile barrage from Iran.

The attack was a stiff challenge for Israel’s air-defense system, which has intercepted projectiles fired from Gaza, Lebanon, Syria, Iraq, Yemen and Iran since the start of the war Oct. 7, 2023. They have ranged from short-range rockets to medium-range missiles to attack drones to ballistic missiles like those fired Friday night.

"Another barrage of dozens of rockets was launched" towards Israel, the statement adds. The IDF says that the explosions people are hearing "originate from interceptions or impacts". We've been hearing from Iran's Supreme Leader Ali Khamenei who says Iran “will inflict heavy blows” after Israel “launched war”.