Four US personnel suffered minor injuries after air strikes on a base in eastern Syria, US officials said on Thursday.
The Syrian Observation for Human Rights, a war monitor based in Britain, and a tribal source said the attack was carried out by Iran-backed militias.
The US-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.
US forces moved into Syria during the campaign against ISIS, linking up 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 war.
A tribal source in the area said rockets were fired by an Iran-backed militia, and two landed in the area of al Omar oilfield where US forces are based in Deir Ezzor 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.
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Farmers spread around wheat kernels unloaded from a combine harvester before being packaged into sacks, in a field in the countryside of al-Kaswa, south of Syria's capital Damascus on June 18, 2020. - Heavy rain and reduced violence provided a relief to Syrian farmers with a good harvest this year, as a tanking economy leaves millions hungry across his war-torn country. Prior to the outbreak of the conflict in 2011, Syria produced more than 4.1 million tonnes of wheat, enough to feed its entire population. But production plunged to record lows during the war, boosting reliance on imports, mainly from regime ally Russia. -
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Syrians shop for clothes at a flea market in the capital Damascus on May 17, 2020, amid severe economic crisis that has been compounded by a coronavirus lockdown. - Prices have doubled over the past year, while the Syrian pound has reached record lows against the dollar, further driving up inflation. With most of the population living in poverty, Syrians have increasingly turned to flea markets to purchase clothes at a reasonable price. -
A handout picture released by the local news site Suwayda 24 shows Syrians chanting anti-government slogans as they protest the country's deteriorating economic conditions and corruption, in the southern city of Suwaida on June 9, 2020. -
A handout picture released by the local news site Suwayda 24 shows Syrians chanting anti-government slogans as they protest the country's deteriorating economic conditions and corruption, in the southern city of Suwaida on June 9, 2020.
The Observatory said rockets had been fired after midnight at the base from an area where Iran-backed militias hold influence. It said the US-led troops returned fire.
The Observatory also reported that explosions were heard in the area before noon on Thursday.
US troops came under rocket fire in the same area last year, in apparent retaliation for US air strikes against Iran-aligned militia in Syria and Iraq.
Iranian-backed militias are heavily concentrated west of the Euphrates in Deir Ezzor province, where they receive supplies from Iraq through the Bukamal border crossing.
