The United States has carried out airstrikes on facilities used by groups affiliated with Iran’s Revolutionary Guard in Syria in retaliation to a drone strike in Syria that killed a US contractor and injured five American troops.
The attack by a suspected Iranian-made drone on a coalition base in north-east Syria and the US response threaten to upend recent efforts to deescalate tensions across the wider Middle East, whose rival powers have made steps toward détente in recent days, after years of turmoil.
The US defense secretary, Lloyd Austin, said in a statement that the American intelligence community had determined the drone was of Iranian origin, but offered no other immediate evidence to support the claim.
“The airstrikes were conducted in response to today’s attack as well as a series of recent attacks against coalition forces in Syria” by groups affiliated with the Revolutionary Guard, Austin said.
Iran relies on a network of proxy forces through the Middle East to counter the US and Israel, its arch regional enemy.
The Pentagon said two of the wounded service members were treated on-site, while three others and the injured contractor were transported to medical facilities in Iraq.
Overnight, videos on social media purported to show explosions in Syria’s Deir ez-Zour, a strategic province that borders Iraq and contains oil fields. Iran-backed militia groups and Syrian forces control the area, which also has seen suspected airstrikes by Israel in recent months allegedly targeting Iranian supply routes.
Iran and Syria did not immediately acknowledge the strikes, nor did their officials at the United Nations in New York respond to requests for comment.
The Syrian Observatory for Human Rights, an opposition war monitor, reported that the American strikes killed six Iranian-backed fighters at an arms depot in the Harabesh neighborhood in the city of Deir ez-Zour. The Observatory, which relies on a network of local contacts in Syria, said US bombing at a post near the town of Mayadeen killed two fighters.
A separate American strike hit a military post near the town of Boukamal along the border with Iraq, killing another three fighters, the Observatory said.
Iran’s paramilitary Revolutionary Guard, which answers only to the supreme leader, Ayatollah Ali Khamenei, has been suspected of carrying out attacks with bomb-carrying drones across the wider Middle East.
In recent months, Russia has begun using Iranian drones in its attacks on sites across Ukraine as part of its war on Kyiv. Iran has issued a series of conflicting denials about its drones being used in the war, though western nations and experts have tied components in the drones back to Tehran.
The exchange of strikes came as Saudi Arabia and Iran have been working towards reopening embassies in each other’s countries. The kingdom also acknowledged efforts to reopen a Saudi embassy in Syria, whose president, Bashar al-Assad, has been backed by Iran in his country’s long war.
US Army Gen. Michael “Erik” Kurilla, the head of the American military’s Central Command, warned that American forces could carry out additional strikes if needed. “We are postured for scalable options in the face of any additional Iranian attacks,” Kurilla said in a statement.
Diplomacy to deescalate the crisis appeared to begin immediately around the strikes. Qatar’s state-run news agency reported a call between its foreign minister and Jake Sullivan, the US national security adviser. Doha has been an interlocutor between Iran and the US recently amid tensions over Tehran’s nuclear program.
Qatar’s foreign minister also spoke around the same time with Iranian foreign minister, Hossein Amir-Abdollahian.
Austin said he authorised the retaliatory strikes at the direction of Joe Biden.
The US under Biden has struck Syria previously over tensions with Iran. In February and June of 2021, as well as August 2022, Biden launched attacks there.
Dareen Khalifa, a senior Syria analyst with the Brussels-based International Crisis Group, said that while Thursday’s exchange of strikes comes at a sensitive political moment due to the “overall deterioration of US-Iran relations and the stalling of the nuclear talks,” she does not expect a significant escalation.
“These tit-for-tat strikes have been ongoing for a long time,” Khalifa said, although she noted that they usually do not result in casualties.
While “the risk of an escalatory cycle is there,” she said, “I think the Biden administration won’t be eager to escalate in Syria now and will instead have a relatively measured response.”
US forces entered Syria in 2015, backing allied forces in their fight against the Islamic State group. The US still maintains the base near Hasakah in northeast Syria where Thursday’s drone strike happened. There are roughly 900 US troops, and even more contractors, in Syria, including in the north and farther south and east.
Since the US drone strike that killed General Qassem Soleimani of the Revolutionary Guard in 2020, Iran has sought “to make life difficult for US forces stationed east of the Euphrates,” said Hamidreza Azizi, an expert with the German Institute for International and Security Affairs.
“Iran increased its support for local proxies in Deir ez-Zour while trying to ally with the tribal forces in the area,” Azizi wrote in a recent analysis. “Due to the geographical proximity, Iraqi groups also intensified their activities in the border strip with Syria and in the Deir ez-Zour province.”
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