She later specified that it would probably start in June based on "military and tactical considerations".
Felat spoke at a press conference in Tabqa, which the SDF captured from ISIS on Wednesday along with its nearby dam.
The black flag of Islamic State no longer flies over Tabqa dam in Syria.
Talal Silo, the military spokesman of the SDF, told Xinhua on Friday that the SDF, backed by the US -led anti-terror coalition, has not yet received heavy weaponry.
"This is yet another victory by the [US-backed] Syrian Arab Coalition and the SDF, our most committed and capable ground force partners in the fight against Isis who remain hard at work erasing ISIS from the battlefield, liberating their own people and lands", said spokesman Col John Dorrian.
His forces would receive "special weapons and armoured vehicles" to enter the city, Hassan said, after President Donald Trump changed USA policy to allow arms deliveries to the SDF s Kurdish component. Displaced residents had begun to return after Tabqa was captured, he added."And now with the advancement of SDF toward Raqqa, huge short-distance displacement is also taking place and also some displacement toward Tel Samen, north of Raqqa", he said.The SDF called on the people of the area to "organise themselves so they can protect the city and the area themselves".
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Hevdeli said the U.S. arms shipments would "arrive soon" and added that Raqqa would be captured without help from other forces.
Tabqa residents began returning to their homes on Friday, but Shahhour Zuair, 46, told AFP the situation remained hard. He made his way back two days ago when he heard the SDF had recaptured the city. "We wouldn t even know where the shelling was coming from", the mother of five said.
The SDF is dominated by the Kurdish People's Protection Units [YPG], seen by the U.S. as an indispensable ally in the fight against IS but considered a "terrorist group" by Turkey.
Turkish president Rayyip Erdogan has moved to soften his criticism of the USA ahead of his official trip to Washington, D.C., next week, reports Reuters.
It began with protests against Syrian President Bashar al-Assad but has since widened into a multi-front conflict that has drawn in world powers. "These are developments that are in contradiction to our strategic relations with the USA and of course we don't want this to happen". Sandbag fortifications left behind by Islamic State fighters lined the roadside in Tabqa city.Some 25,000 people had been displaced from Tabqa during fighting in recent weeks, staying in informal settlements south of the city, a United Nations refugee agency official in Syria, Roupen Alexandrian, said.