Meanwhile, rebel shelling of government-held areas in the divided city killed two girls at a school. The airstrikes came a day after an air raid hit eastern Aleppo's biggest market, killing at least 15 people and leveling buildings.
Aleppo's unabating violence has given additional urgency to the upcoming meeting between Russian Foreign Minister Sergey Lavrov and US Secretary of State John Kerry on efforts to find a peace deal in Syria in Switzerland on Saturday. It will be the first face-to-face contact between the two men since Washington broke off bilateral diplomatic contact with Moscow on Syria over the violence in Aleppo earlier this month.
The battle for Mosul is expected to be the most complex yet for Iraqi forces, backed by US-led coalition air-power.
Since Mosul first fell to IS in June 2014, the extremists have been pushed from more than half of the territory they once held in Iraq, according to figures released by Iraqi Prime Minister Haider al-Abadi's office.
The two commanders, from Iraq's powerful Asaib Ahl Haq and Kataib Hezbollah militias, said more than 2,000 of their fighters have been withdrawn from Syria, mostly from in and around Aleppo, for redeployment near Mosul and the IS stronghold of Hawija. The two spoke to The Associated Press in Baghdad on condition of anonymity because they were not authorized to discuss military tactics.
Earlier this month, an official with the Iraqi Shiite al-Nujaba militia said it sent some 4,000 fighters to Syria, also to the Aleppo area. The two Iraqi commanders said the al-Nujaba militiamen were not part of the pullout.
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