Two Australian hornets dropped six bombs as part of botched coalition air strikes which killed dozens of Syrian forces earlier this year, a US-led military investigation has confirmed.

Key points: 83 people killed in botched airstrike involving two Australian Hornets in Syria

83 people killed in botched airstrike involving two Australian Hornets in Syria "Unintentional human errors" behind deadly mistake, according to US military-led investigation

"Unintentional human errors" behind deadly mistake, according to US military-led investigation No coalition personnel will be sanctioned over airstrike

In September, coalition aircraft accidently bombed forces aligned to the Syrian government in an operation around the Deir al-Zor military airport in Syria's east, which was supposed to target fighters in the Islamic State (IS) terrorist group.

Russia claims as many as 83 people were killed.

The investigation blamed "unintentional human errors" for the deadly mistake, while Australia's Defence Department has confirmed two RAAF hornets dropped bombs in the incident.

The department said there will be improved information sharing among coalition partners following the review, but no coalition personnel will be sanctioned.

The strikes came less than a week into a fragile ceasefire aimed at stopping the bloodshed in Syria's five-year civil war.

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The US military and Australia's Defence Department at the time said the attack was called off after Russia informed the coalition that Syrian military personnel and vehicles may have been hit.

Pentagon press secretary Peter Cook said in an emailed statement that Russian officials did not voice concerns when they were informed that coalition aircraft would be operating in the strike area.

Russia demanded an emergency United Nations Security Council session to discuss the incident and accused the US-led coalition of jeopardising the Syria deal and helping IS.

The US ambassador to the United Nations, Samantha Power, in turn chastised Russia for the move, accusing it of "cheap point-scoring and grandstanding".