Islamic State terrorists are plotting to shell Kurdish-led militia with chemical-filled munitions in Deir ez-Zor, Syria, Russian military said. The terrorists want to frame Damascus for the attack to trigger new US-led airstrikes.

Islamic State (IS, formerly ISIS) has launched production of toxin-filled mortar shells in the east of the Deir ez-Zor province, Russian military said on Wednesday. The shells are filled with chemicals by a crew of 11 terrorists, who received foreign training and came to Syria specifically to carry out the false-flag attack.

IS militants are seeking to shell positions held by the US-backed Syrian Democratic Forces (SDF), framing Damascus for the attack. The terrorists seek to trigger massive airstrikes by the US-led coalition against the government forces, the military said.

Russia will send a nuclear, biological and chemical (NBC) warning system to the location, as well as Russian NBC specialists, to monitor IS activities, it added.

IS terrorists are currently holding an area in the far east of the country on the left bank of the Euphrates river. The SDF have been battling them for months yet have not managed to eradicate the militants despite receiving heavy air support from the US-led coalition. The strikes have apparently taken a heavy civilian toll, with local media routinely reporting casualties. The coalition has been also accused of using banned munitions in the area, namely white phosphorous bombs to target settlements in the IS-occupied territory.

READ MORE: Syria blames foreign states for Aleppo ‘toxic gas attack’, calls for UN to step in

Moscow’s warning comes shortly after a chemical attack in the city of Aleppo, where anti-government militants apparently shelled the western part of the city with a “poisonous substance,” affecting over 50 people. The attack, however, has not drawn much attention from the international community, let alone resulted in airstrikes against the attackers.

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