U.S. Launches Attacks on Iranian-Backed Forces in Iraq and Syria

WASHINGTON — The United States military on Sunday struck five targets in Iraq and Syria controlled by an Iranian-backed paramilitary group, in response to a rocket attack on Friday that killed an American contractor, the Pentagon said.

The airstrikes, carried out by Air Force F-15E fighter planes, hit three locations in Iraq and two in Syria, all controlled by the paramilitary group, Kataib Hezbollah.

Jonathan Hoffman, the chief Pentagon spokesman, said the targets included weapons storage facilities and command posts that were used to attack American and partner forces.

Mr. Hoffman said the United States would conduct additional strikes if the attacks by Kataib Hezbollah did not stop. Iranian proxy forces have carried out 11 attacks over the last two months on bases and facilities housing American contractors and service members, an American official said.

“Iran and their K.H. proxy forces must cease their attacks on U.S. and coalition forces, and respect Iraq’s sovereignty, to prevent additional defensive actions by U.S. forces,” Mr. Hoffman said.

The ammunition facilities held both rockets and drones used by Kataib Hezbollah. The command and control buildings had been used by the group to plot attacks. The ordnance dropped by the F-15Es on the ammunition depots set off several large secondary explosions, American officials said, confirming that the facilities were used to store a significant amount of weaponry.

Three people were killed and several were injured in the strikes, including one man identified as a commander of a Kataib Hezbollah brigade. American officials have not been able to confirm how many members of the group were killed.

Officials did not identify the precise location of the sites. The strikes in Syria took place in the Euphrates River Valley in the southeast, officials said.

While President Trump has sought to wind down the American war against the Islamic State in Iraq and Syria, he has built up forces meant to deter against Iranian attacks. Trump administration officials have also said American forces were in Iraq to help counter Iranian influence in Iraq and the region.

As rocket attacks by Iranian proxies have increased in recent weeks, some Defense Department officials have been worried that the situation could escalate beyond the kind of shadow conflict that the United States and Iran have been engaged in.

The death of the American contractor and the response by the Pentagon could potentially lead to a further escalation. Iran could respond with a renewed roadside bomb campaign or more powerful rocket and missile attacks, a move that would most likely result in a more aggressive response by the United States.

American military commanders have warned for months about a growing risk of attacks by Iranian proxy forces on American interests and forces in the region, as Tehran chafes against the Trump administration’s renewed economic sanctions and pressure campaign.

So far Iran and its proxies have mostly focused on American allies and partners. The United States has accused Iran of striking at oil tankers in the Arabian Sea and launching drone and cruise missile attacks on Saudi oil facilities. Iran also shot down an American drone.

In response, the United States launched a series of cyberattacks, but Mr. Trump resisted a larger military airstrike.

Friday’s rocket attack on a major Iraqi base where American and allied troops train Iraq’s security forces was a far more direct strike at United States forces.

Kataib Hezbollah launched more than 30 rockets against the base, which is near Kirkuk and is known as K1. The rocket attacks killed the American contractor and wounded four American service members and two members of the Iraqi security forces, Mr. Hoffman said.

That attack was one of the two largest over the last two months and the only one to kill an American citizen, the American official said.

The rising number of attacks in recent months had prompted diplomatic warnings, including private requests to the Iraqi government to pressure Iran to stop the attacks. In addition, Secretary of State Mike Pompeo and Defense Secretary Mark T. Esper had said in recent weeks that Iran would be held to account for attacks by its proxy forces on Americans.

Kataib Hezbollah has tight ties with Iran’s Quds Force, an elite unit of the Iranian Revolutionary Guards Corps, the Pentagon said. Iran has long supported the group by providing weapons and other lethal aid.

While Iran does not always have direct control over its allied paramilitary groups, current and former military officials have long contended that Tehran is able to control the level of violence in Iraq through its militia and paramilitary groups. Iran also provides broad direction on what kind of attacks the groups make and how often they target American or allied forces.

The United States military warned the Iraqi government, along with other coalition partners, before the strikes against Kataib Hezbollah.

American officials have also been telling Iraq that their tolerance for the strikes by Iranian proxy forces is low. Mr. Hoffman said that while the United States military is in Iraq at the request of the Iraqi government, American forces reserve the right to act in self-defense.

Thomas Gibbons-Neff contributed reporting.

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