The U.S.-led military coalition says it has "definitively determined" that it did not conduct an alleged airstrike in the Iraqi town of Daquq that killed civilians last week during the battles for Mosul. Human Rights Watch has also called for an investigation into the attack, which happened on Friday and which the New York-based group says targeted the women's section of a Shiite mosque in Daquq, killing more than a dozen people. Iraqi special forces have begun shelling Islamic State positions near Mosul in the latest phase of a massive operation to retake the militant-held city. The campaign to retake Mosul comes after months of planning and involves more than 25,000 Iraqi troops, Kurdish forces, Sunni tribal fighters and state-sanctioned Shiite militias.