According to the sources, 15 Apache attack helicopters landed in several of the 14 illegal enclaves, with the aim of increasing offensive capabilities and fortifying these bases against possible attacks.
Also, a military cargo plane landed at the Al-Omar oil field in eastern Deir Ezzor province with about 50 U.S. military personnel on board.
A similar aircraft brought logistical equipment to the Live Stone base in Hasakeh province.
On the other hand, the US military launched a surveillance, reconnaissance and aerial spying balloon from their base in the Koniko gas field, a few hundred meters from the positions where the Syrian army and its allies are deployed.
Local activists had reported that U.S. forces are on high alert for fear of being targeted by missile and drone bombardment.
Last July 28, two bombings were reported in less than 24 hours against the facilities of the Konico gas field converted into a Pentagon military barracks.
Similar actions against US military targets are usually claimed by the Iraqi Islamic Resistance, an ally of the Syrian army in the fight against terrorism and occupation.
The aforementioned group assures that its incursions are part of the approach of resistance to the occupier and in response to the US support to the genocide committed by Israel against the Palestinian people in the Gaza Strip.
Washington maintains some 14 bases on Syrian territory without the consent of the Damascus government or the approval of the United Nations.
Syria repeatedly denounced this presence, which it described as an occupation, and assured that the actions of the U.S. military in the national territory encourage terrorist activity and aim at destabilizing the country and plundering its wealth.
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