The air strikes allegedly targeted the village of Hajin, the last major stronghold of ISIS in Syria, and resulted in fires, but there was no information regarding casualties.
The bombs, whose use in civilian areas is banned under the 1949 Geneva Conventions, were apparently dropped by US F-15 fighter jets.
A pentagon spokesman denied that US planes dropped these bombs.
Commander Sean Robertson said: “At this time, we have not received any reports of any use of white phosphorus.
“None of the military units in the area are even equipped with white phosphorus munitions of any kind.”
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Human rights groups have said the US-led coalition against ISIS has previously used white phosphorus munitions on numerous occasions in Syria.
The bombs can create thick white smoke screens and start fires.
Their use in populated areas and against military targets in areas surrounded by civilian populations is banned.
Lieutenant-General Vladimir Savchenko commented on the alleged bombings, stating: “Following the strikes, large fires were observed in the area.
“There’s still no information on casualties caused by the bombing run.”
Tensions between the US and Russia have escalated in recent weeks, as President Donald Trump prepares for the possibility of Syria using chemical weapons in an expected assault on Idlib, the last major rebel stronghold.
The Russian Defence Ministry claims that a fake chemical weapon attack will be staged, giving the US an excuse to start raining down bombs.
President Trump warned the Syrian government, as well as Russia and Iran, not to make a “grave humanitarian mistake” by “recklessly attacking” the rebel enclave.
Syrian and Russian forces resumed airstrikes in the area yesterday, after a Russian-Iranian-Turkish summit failed to agree on a ceasefire.
Meanwhile, Russia has held naval drills in the Mediterranean Sea near Syria in a move that it claims is a response to US military build-up in the area.