Russian news agencies quoted the ministry as saying the cause could have been technical malfunction.
"Everyone sees that the US-led coalition is pretending to fight Islamic State, above all in Iraq, but continuing to allegedly fight Islamic State in Syria actively for some reason", Major-General Igor Konashenkov, a spokesperson for the Russian Defence Ministry, told reporters.
The Pentagon strongly denied the accusations, saying that the US -led coalition fighting Islamic State posts data every day on the number and result of strikes for the public to see. "It is purely for military ethics reasons that we do not publish the latest photos of the United States base in al-Tanf with an abundance of pick-up trucks with heavy machine guns and recoiless guns that are not typical of the U.S. army", he noted.
He said they moved to Tafas, about 185 miles west.
Maj. Gen. Igor Konashenkov said that truce in the southern de-escalation zone in Syria could be undermined after the relocation of 600 militants and two convoys with medical aid into the area.
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According to Konashenkov, 600 militants who arrived from the US-controlled area near Al-Tanf should have either clashed with these cells to seize medicines and food or should have acted alongside with them.
October 10, 2017 (EIRNS)-The Russian Foreign Ministry announced that over 91% of Syria has been liberated from Islamic State (IS) forces, RT reported yesterday.
"Considering such serious manpower reinforcements with U.S. benevolence and the creation of the stock of medicines with food supplies, one should not be an expert to forecast an attempt to disrupt the peace agreement now in the southern de-escalation zone as well".
Syrian army general Ali al-Ali said the day before that trucks carrying weapons, vehicles and other supplies for the US-backed Kurdish-Arab Syrian Democratic Forces (SDF) coalition fighting Isis in the north of the country had actually ended up in the extremists' hands over the last few months.
In his turn, Director of the North America Department at the Russian Foreign Ministry Georgiy Borisenko told Sputnik that USA actions near the al-Tanf base in Syria are reminiscent of an attempt to divide the war-torn state.