The TV also said people took to streets in Deir al-Zour and the northern cities of Aleppo and Hasakah to celebrate the victory.

Meanwhile, President Assad contacted the chief of the military operations in Deir al-Zour, hailing the victory there.

The Russian forces have also played an important role in the big victory.

The Russian naval grouping which operates in the Syrian waters fired several Kalibr cruise missiles at IS positions near the city.

The strike ensured the success of the advances of Syrian government troops and contributed to the disruption of IS attempts to regroup forces and strengthen positions near Deir al-Zour, the Russian Defense Ministry said.

Russia has been participating in anti-terror operations in Syria since September 2017 at the request of Assad.

Deir al-Zour is the last major stronghold of IS, as the terror-designated group is also losing its de facto capital of Raqqa to the U.S.-backed Syrian Democratic Forces, which has captured more than 60 percent of Raqqa.

In a statement on Tuesday, the Syrian army said breaking the siege to Deir al-Zour constitutes a turning point in the war on terror.

Lifting the siege of Deir al-Zour proves the Syrian army's ability to deal a full defeat to the terrorist project in Syria, it said.

It also brings down the foreign plans to fragment Syria, the statement said, adding that the victory will pave the way for more military operations against IS in Deir al-Zour.

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