Iran launched dozens of ballistic missiles toward Israel on Friday night in retaliation for Israel's surprise attack early Friday. Israel struck at the heart of the Iran's nuclear program, killing several nuclear scientists as well as high-ranking military leaders, according to Israeli officials.

After striking back on Friday night, Iran launched a new wave of strikes toward Israel on Saturday morning. Now, the two countries continue to exchange deadly missiles and threats, with fatalities and injuries reported on both sides.

Explosions reported in capital Tehran as Israeli Defence Minister announces "pre-emptive strikes" and announces state of emergency

Israeli Prime Minister Benjamin Netanyahu was coy about whether the ultimate goal of the preemptive strikes on Iran is regime change, but made clear that such a powershift would be a welcome

Israel has reportedly carried out a pre-emptive strike targeting sites in Iran, according to Israeli media outlet Channel 12. The attack comes amid heightened regional tensions, with Al Jazeera reporting loud explosions in Tehran shortly after the strike. Axios also confirmed that air raid sirens were heard across multiple locations in Israel.

NBC News Chief Foreign Correspondent Richard Engel joins MSNBC's Lawrence O'Donnell to share the latest about what he's learning from his sources in Israel and Iran about the extent of the strikes by Israeli forces across Iran and how the Iranian government is likely to respond.

President Trump said Sunday Iran and Israel should "make a deal," even as the two nations continued to carry out missile strikes.