"We assess today that the Iraqis will have in early October all the forces marshaled, trained, fielded, equipped that are necessary for operations in Mosul," General Joe Dunford, Chairman of the Joint Chiefs of Staff, said at a military event in Washington.
"Timing of that operation now is really just a function of a political decision by Prime Minister (Haider al-)Abadi."
Iraqi forces have been moving northwards from Baghdad for almost two years, gradually retaking areas over which IS declared its "caliphate" in June 2014.
Kurdish peshmerga forces to the north of Mosul will also join the assault.
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