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The United States has accused the Syrian military of carrying out airstrikes to help ISIS fighters advance around the northern city of Aleppo, messages posted on the U.S. Embassy Syria official Twitter feed said, Reuters reports. 

ISIS fighters pushed back rival insurgents north of Aleppo Sunday near the Turkish border, threatening their supply route to the city, fighters and a group monitoring the war said.

Fighters from Levant Front, a northern alliance which includes Western-backed rebels and Islamist fighters, said they were worried ISIS was heading for the Bab al-Salam crossing between Aleppo and the Turkish province of Kilis.

"Reports indicate that the regime is making airstrikes in support of ISIS's advance on Aleppo, aiding extremists against Syrian population," a post on the U.S. Embassy Syria Twitter account said late Monday.

Syrian officials have previously dismissed as nonsense allegations by Washington and Syrian opposition activists that the Syrian military has helped ISIS's fight against rival Syrian insurgent forces.

"The Syrian army is fighting ISIS in all areas where it is present in Syria," a military source said.