With aerial support from the US-led coalition, Iraqi police and army troops launched the offensive Sunday, part of a 100-day-old campaign that has already driven the militants from the eastern half of the city.
Iraqi helicopters fired rockets at the village of Abu Saif early yesterday, targeting a hill that overlooks the city's airport. By noon, the forces entered the village and gained control over much of the strategic hill as fighting was still raging.
A US-led coalition has been providing close air support throughout the campaign to retake Iraq's second-largest city. US special operations forces are embedded with some Iraqi units and thousands of US troops are in Iraq providing logistical and other support.
Meanwhile, US Secretary of Defense Jim Mattis was holding discussions with US and Iraqi officials, a week before he is expected to present a new strategy to President Donald Trump for defeating the Islamic State group.
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"We're going to make certain that we've got good situational awareness of what we face as we work together and fight alongside each other," Mattis told reporters traveling with him.
The battle for western Mosul, the extremist group's last major urban bastion in Iraq, is expected to be the most daunting yet.
The streets are older and narrower in that sector of the city, which stretches west from the Tigris River, forcing Iraqi soldiers to leave the relative safety of their armored vehicles. The presence of up to 750,000 civilians also poses a challenge.
IS claimed responsibility for two attacks in an online statement, saying the attackers were British and Iraqi.