Now playing Next USA Iranian ambassador to UN says Iran will retaliate for illegal 'act of aggression' Majid Takht Ravanchi told NBC News there will be "harsh revenge" for the killing and he believes the Trump administration "does not believe in dialogue." 04/01/2020
Now playing Next USA Who are Iraq's secretive Quds Forces? After a U.S. strike killed Iranian Gen. Qassem Soleimani, NBC News looks the secretive Quds Forces that he headed and his successor Maj. Gen. Esmail Ghaani. 03/01/2020
Now playing Next USA Who are Iran's secretive Quds Forces? After a U.S. strike killed Iranian Gen. Qassem Soleimani, NBC News looks the secretive Quds Forces that he headed and his successor Maj. Gen. Esmail Ghaani. 03/01/2020
Now playing Next USA Planned attacks against U.S. targets in Syria, Lebanon were reason for Soleimani strike, say officials Targets in Syria under threat included military outposts, officials said. In Lebanon, Soleimani was allegedly planning attacks on diplomatic targets. 03/01/2020
Now playing Next Iraq US sends 3,000 troops to Middle East as Iran vows 'harsh retaliation' The killing of Iranian General Qassem Soleimani has ignited fears the conflict between Iran and the US could spread through the whole region. 03/01/2020
Now playing Next USA Trump on Soleimani strike: 'His reign of terror is over' Trump made the comments a day after ordering the airstrike that killed Iranian general Qassem Soleimani in Baghdad. 03/01/2020
Now playing Next USA How Iran could retaliate around the world Analysis: Iran has many weapons, from hackers to Hezbollah, and potential targets that range from embassies to individual U.S. citizens. 03/01/2020
Now playing Next World News This week in pictures: New year festivities, disasters & more protests Here is our selection of the most eyecatching photographs from this last week. 03/01/2020
Now playing Next USA Trump's Iran move puts 2020 Democrats in a political bind Analysis: Bernie Sanders ripped the president outright, while other top hopefuls tempered their criticism with condemnation of the Iranian commander who was killed. 03/01/2020
Now playing Next Iran Timeline: How the Iran crisis unfolded after Qassem Soleimani's murder Reaction to the killing of Iran military chief Qassem Soleimani has been flooding in. Here's a chronological recap. 03/01/2020
Now playing Next USA Was it legal for Donald Trump to order the killing of a top Iranian general? Analysis: The U.S. government justified the strike as an act of self-defense, but a top UN official questioned the operation in a series of tweets. 03/01/2020
Now playing Next Iran Iran 'will fall into the hands of militant and hardline elements' Iran "will fall into the hands of the most militant and hardline elements," @AliVaez of the ICG told Euronews. 03/01/2020
Now playing Next World News Is US drone strike to kill Iranian general legal? The US say it is, and it's relatively straightforward. 03/01/2020
Now playing Next USA Trump tweets after U.S. strike: 'Iran never won a war, but never lost a negotiation' Iran's president has vowed "revenge" and its supreme leader has pledged "harsh retaliation" for the killing of top Iranian general Qassem Soleimani. 03/01/2020
Now playing Next USA Who was the Iranian 'shadow commander' killed in a U.S. airstrike? The 62-year-old Major General led Iran's elite Quds Force, which had a hand in both fighting the Islamic State and U.S. forces. 03/01/2020
Now playing Next Iran US-Iran war is a lot closer but won't be conventional — expert Iran expert Soraya Lennie tells Euronews: "I really don't see a lot of positive avenues left open to de-escalate this crisis. 03/01/2020
Now playing Next USA Oil price jumps on fear of Iranian retaliation against U.S. The international benchmark for crude oil jumped 4.1%, or $2.70, to $68.95 a barrel in London trading. 03/01/2020