Kurdish-led Syrian Democratic Forces (SDF) are to announce an official operation to release Raqqa city from Islamic State.
Senior Kurdish officials said the announcement would be made today (June 6) at a press conference, according to ARA News.
The statement will say that a major attack on the city of Raqqa, Syria is planned by a US-backed alliance of Arab and Kurdish fighters.
On Sunday (June 4) Turkish Prime Minister Binali Yildirimm claimed this operation began on June 2.
But a spokesman for the US-led coalition, John Dorian, has stated no date for the start of the liberation campaign has yet been set.
The SDF liberated three villages in the northern countryside of Raqqa on Monday (June 5) and the group killed at least 36 Isis militants.
Coalition spokesperson Colonel Ryan Dillon has said: "The coalition conducted 59 strikes in support of the isolation of Raqqa this past week, hitting fighting positions, construction equipment, artillery systems and command and control nodes."
He also said the SDF and the Raqqa Civilian Council have asked civilians to leave Raqqa.