MOSCOW, June 11 (Xinhua) -- Militants of the so-called "Free Syrian Army" with the assistance of U.S. military special operations forces are mulling a fake chemical attack in Syria, the Russian military said Monday.

The intelligence was confirmed by three independent channels in Syria, said Russian Defense Ministry spokesman Igor Konashenkov in a statement.

The Free Syrian Army militants have brought chlorine cylinders to a settlement in the Syrian province of Deir al-Zour to fake a chemical attack by the Syrian government troops against civilians, Konashenkov said.

A video of the staged attack, after it is disseminated in the western media, will serve as a new pretext for the U.S.-led coalition to strike Syrian targets and justify an offensive by militants against Syrian government forces on the eastern bank of the Euphrates River, he said.

The ministry said it is intolerable to use such a provocation to destabilize Syria, Konashenkov said.

The United States, along with Britain and France, launched joint airstrikes on military targets in Syria on April 14, in response to what they said was the Syrian military's use of chemical weapons in Douma, a then rebel-held town in Eastern Ghouta near the Syrian capital of Damascus on April 7.

However, Russia said that no traces of the chemical attack had been found and that the event was staged.