Russian Federation said 62 soldiers were killed in the strikes, while the UK-based Observatory said the attack left at least 90 dead.
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Whether U.S. warplanes conducted the attack is in question.
A senior adviser to President Bashar al-Assad said the Syrian regime believed the strike that killed the Syrian soldiers was “intentional”.
US Secretary of State John Kerry has told the BBC that Russian Federation needs to be more serious about getting the Syrian government to abide by the terms of the ceasefire.
Kerry said it was important to set up a joint coordination center with Russian Federation – which is part of the cease-fire deal – to avoid the “terrible thing that happened yesterday, that we all acknowledge and regret but it happens when you have conflict”.
The Russian Foreign Ministry, in a statement Sunday after a meeting of the U.N. Security Council, said the United States “not only turned out to be unable to give an adequate explanation of what happened, but also tried, as is their custom, to turn everything upside down”.
Also Sunday, the Syrian government and opposition reported violations of the cease-fire that went into effect on Monday.
American officials said the US-led coalition fighting the Islamic State group may have hit Syrian military positions.
“We are reaching a really terrifying conclusion for the whole world: that the White House is defending IS”.
The foreign ministry said Saturday’s incident was a result of the US’s “stubborn refusal” to co-operate with Moscow in fighting IS, the Nusra Front – now renamed Jabhat Fatah al Sham – and “other terrorist groups”.
The US ambassador to the UN, Samantha Power, rebuked Russian Federation for the move.
Six days after the start of a fragile truce, air strikes are reported to have targeted anti-government groups in Aleppo.
Russia’s United Nations ambassador Vitaly Churkin said the latest attack put “a very big question mark” over the truce’s future. Moscow said militants there were preparing for large-scale military actions against Syria’s army.
“In their opinion, killing a 83 Syrian soldiers, and injuring more than 100, and destroy a Syrian military post, is a simple technical error”.
The Observatory said at least eight people died and many were seriously injured when helicopters dropped barrel bombs in a rebel-held part of the southern Syrian province of Daraa on Sunday.
The UN said aid trucks that had been expected to move to Aleppo on Sunday were once again being delayed.
The ceasefire agreement, brokered by the United States and Russian Federation, promised a nationwide truce from sundown on Monday (local time), improved access for humanitarian aid and joint military targeting of hard-line Islamist groups. Separate U.S. -led, Damascus-led and Turkey-backed operations against the militants have continued.
Turnbull says Australian rules of engagement were to target the Islamic State movement.
The Syrian army said the raid had allowed ISIS fighters to gain ground around the key eastern airbase of Deir al-Zor, but a military source said government forces were back on the offensive yesterday.
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America apologised for the bombing which occurred on a base near the eastern Deir al Zor airport, insisting their intended target was Islamic State fighters. In Aleppo, warplanes fired missiles at three neighborhoods, wounding several people, according to the activist-run Local Coordination Committees and the Observatory.
