It was no mistake.
It was a coordinated attack on a Syrian Army base by Islamic State and the USAF.
The ISIS launched attacks on the Syrian army positions in Deir Ezzor only 7 minutes after the US-led coalition's airstrikes on Saturday, a military source said, adding that the air and ground assault were highly coordinated, According to FNA report.
The source said after the coalition's pounding of the Syrian army near Deir Ezzor airbase, the ISIS could take full control of al-Tharda mountain and then Deir Ezzor military base, adding that the army and national defense forces deployed near the airbase immediately won it back from the terrorists by launching a counterattack.
Noting that Deir Ezzor is now almost in tranquility and no change has occurred in the military map of the region, the source said by attacking the Syrian army positions, the US seeks to prevent military operations to break the terrorists' siege on the city.
The source said the simultaneous raid of the ISIL terrorists immediately after the coalition airstrikes is the best evidence of the high coordination done between the US and the terrorists.