BEIRUT — Iran on Friday vowed “severe revenge” in response to a U.S. drone strike that killed Tehran’s most powerful military commander, Maj. Gen. Qasem Soleimani, and dramatically sharpened tensions across the Middle East.

Soleimani was a towering figure in Iran’s power projection across the region, with close links to a network of paramilitary groups that stretches from Syria to Yemen. His death in the smoldering wreckage of a two-car convoy in the Iraqi capital, Baghdad, left U.S. outposts and personnel bracing for retaliatory attacks and oil prices shooting upward. The U.S. Embassy in Iraq warned its citizens to leave “immediately.”

‘Down with U.S.’: Iranians express outrage after killing of Soleimani
Iranians gathered in the streets of Tehran on Jan. 3 to mourn Qasem Soleimani, a top commander killed by a U.S. drone strike in Iraq. (AP)

“With his departure and with God’s power, his work and path will not cease, and severe revenge awaits those criminals who have tainted their filthy hands with his blood and the blood of the other martyrs of last night’s incident,” Iran’s supreme leader, Ayatollah Ali Khamenei, said in a statement.

The country’s defense minister, Amir Hatami, said the nighttime strike ordered by President Trump would be met with a “crushing” response.

Secretary of State Mike Pompeo said the attack was spurred by intelligence assessments indicating that Soleimani was overseeing an “imminent” attack on American citizens in the Middle East.

“I can’t talk too much about the nature of the threats, but the American people should know that President Trump’s decision to remove Qasem Soleimani from the battlefield saved American lives,” Pompeo told Fox News. In a tweet, the president said that Soleimani had “killed or badly wounded thousands of Americans over an extended period of time, and was plotting to kill many more . . . but got caught!”

The basis for Trump’s statement remained unclear, although it followed comments Thursday by Defense Secretary Mark T. Esper suggesting that Iran and its proxies may be preparing renewed strikes on U.S. personnel in Iraq.