Iran has vowed to retaliate over the assassination of the country’s top military commander Major-General Qasem Soleimani.

Iranian Foreign Minister Mohammad Javad Zarif warned Friday that the targeted killing of Soleimani was “extremely dangerous & a foolish escalation.”

“The U.S. bears responsibility for all consequences of its rogue adventurism,” Zarif said on Twitter.

Soleimani, head of Iran’s elite Quds Force, was killed in a U.S. military airstrike at Baghdad’s international airport. The move was directed by U.S. President Donald Trump, the Pentagon said Thursday.

The U.S. State Department designates the Iranian Quds Force as a foreign terrorist organization, and Soleimani has been blamed for the deaths of hundreds of American and coalition service members. The Pentagon said Soleimani approved this week’s attacks on the U.S. Embassy in Baghdad.

“A crushing revenge will be taken for Soleimani’s unjust assassination ... We will take revenge from all those involved and responsible for his assassination,” Iranian Defence Minister Amir Hatami was quoted by state news agency IRNA as saying.

Iranian President Hassan Rouhani said his death will make Iran “more decisive” in its resistance against the U.S.

“Soleimani’s martyrdom will make Iran more decisive to resist America’s expansionism and to defend our Islamic values,” Rouhani said on state television, Reuters reported. “With no doubt, Iran and other freedom-seeking countries in the region will take his revenge.”

Analysts warn that there will be backlash from Tehran.

“Iranian leaders are proud and quite risk acceptant,” said Eurasia Group. “We expect moderate to low level clashes to last for at least a month and likely be confined to Iraq. Iranian-backed militias will attack US bases and some US soldiers will be killed; the US will retaliate with strikes inside of Iraq,” said Henry Rome and Cliff Kupchan, analysts from political consultancy, in a report.

They predict that Tehran’s response “will stop short of what we would consider war,” and added that “the chance of war is 40%.”

“This is a watershed moment in the struggle between Iran and the U.S. in the Middle East,” Emily Hawthorne, Middle East & North Africa analyst at Stratfor, told CNBC in an email on Friday.

“Striking Soleimani, the head of Iran’s overseas military operations, is a significant attack on Iran’s ability to direct proxy warfare and will be met with Iranian retaliation against the U.S.,” she said.

Tensions between the U.S. and Iran escalated on Sunday after Washington carried out precision strikes on Iranian-backed militia in five locations in Iraq and Syria. The U.S. attacks reportedly killed 25 fighters of the Iran-backed militia in Iraq, the Kataeb Hezbollah.

The airstrikes triggered protests from Iran-backed militia in Iraq who stormed the U.S. Embassy in Baghdad on New Year’s Eve and set fire to the reception area. Responding to the violence, Trump deployed some 750 U.S. soldiers to the Middle East.

“The people who breached the U.S. embassy wall were supporters of Iran-based militias in Iraq. Yes, they are predominantly Iraqi, if not all of them are Iraqi, but they are supported and backed equipped by Iran,” said Hawthorne.

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