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Four U.S. personnel suffered minor injuries after strikes on a base in eastern Syria, U.S. officials said on Thursday, an attack which a war monitor and a tribal source said was carried out by Iran-backed militias.

In a statement, the U.S.-led coalition said the service members were being evaluated for minor injuries and possible traumatic brain injuries after two rounds of “indirect fire” hit support buildings at the Green Village in eastern Syria.

An investigation was under way, the coalition said.

U.S. forces have deployed into Syria during the campaign against Islamic State, partnering with a Kurdish-led group called the Syrian Democratic Forces. Iran-backed militias have established a foothold in Syria while fighting in support of President Bashar al-Assad during the country’s 11-year-long war.

A tribal source in the area said several rockets were fired by an Iran-backed militia, and two landed in the area of al Omar oil field where U.S. forces are based in Deir al-Zor province, near the Iraqi border.

The rockets were launched from an area west of the Euphrates River, where Iran-backed militias have a presence, the source said.

The Syrian Observatory for Human Rights said rockets had been fired after midnight at the base from an area where Iran-backed militias exercise influence.

The Observatory, a U.K.-based organization that reports on the war in Syria using what it describes as sources on all sides of the conflict, said the U.S.-led forces returned fire.

Reuters could not independently verify the report.

The Observatory also reported that explosions were heard in the area before noon on Thursday.

U.S. troops came under rocket fire in the same area last year, in apparent retaliation for U.S. air strikes against Iran-aligned militia in Syria and Iraq.

Iranian-backed militias are heavily concentrated west of the Euphrates in Deir al-Zor province, where they get supplies from Iraq through the al-Bukamal border crossing.

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