An Iraqi paramilitary force has accused the US-led coalition against the Islamic State (IS) group of killing 22 of its fighters in an air strike in eastern Syria.
However, the coalition says it did not carry out any strikes in the area.
Syrian state media had earlier reported that the coalition had hit pro-government forces, causing casualties.
Iraq's Popular Mobilisation said missiles hit one of its positions on the Iraqi-Syrian border overnight.
The paramilitary force is led by Iran-backed Shia Muslim militias and is itself fighting IS.
On Monday morning, Syria's state-run Sana news agency cited a Syrian military source as saying coalition aircraft had bombed one of its positions in al-Huri, a village about 3km (2 miles) south-east of Albu Kamal and 1.5km north-west of the Syrian-Iraqi border crossing.
The source did not give any precise casualty figures, saying only that a number of people had been killed and others wounded.
The Syrian Observatory for Human Rights, a UK-based monitoring group, said it had documented the deaths of 52 people, including 30 Iraqi and 16 Syrians.
Later, the Popular Mobilisation issued a statement alleging that a US aircraft had fired two guided missiles at one of the force's fixed positions about 700m (2,230ft) from the border at 22:00 (19:00 GMT) on Sunday, killing 22 fighters.
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