Israel’s ongoing attacks on Iranian nuclear sites, generals, and scientists killed 78 people and wounded more than 320 on Friday, Iran’s ambassador told the U.N. Security Council, but he said “the overwhelming majority” of victims were civilians. Israel described the new wave of hostilities as the beginning of “Operation Rising Lion.”

Tehran said American bases in the Middle East could face reprisals if the U.S. helped repel Iranian attacks on Israel.

In response to Israel’s attack, Iran fired back with more than 100 drones. NBC News’ Chief International Correspondent Keir Simmons reports more. Former NATO Supreme Allied Commander retired Gen. Wesley Clark and Senior Fellow at the Carnegie Endowment for International Peace Aaron David Miller join Ana Cabrera to examine the possibility of further attacks.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

The death toll is growing as Israel and Iran exchanged missile attacks for a third consecutive day on Sunday, and Israel is warning that worse is to come. Israel targeted Iran's Defense Ministry headquarters in Tehran and sites it alleged were associated with Iran's nuclear program,

Israel says it has more attacks planned against Iran after a series of overnight strikes targeted Tehran’s nuclear program and shook global tensions. As Washington watches the fallout, President Donald Trump is continuing to push Tehran toward the negotiating table to come to a nuclear deal.