U.S.-backed Iraqi forces moved closer on Wednesday to a town south of Mosul where aid groups and regional officials say Islamic State has executed dozens of prisoners.

A military statement said security forces advanced to the edge of Hammam al-Alil, a thermal water resort, after an elite unit breached the eastern limits of Mosul, the ultra-hardline group’s last major city stronghold in Iraq.

The battle that started on Oct. 17 with air and ground support from a U.S.-led coalition is shaping up as the largest in Iraq since the U.S.-led invasion of 2003.

Mosul still has a population of 1.5 million people, much more than any of the other cities captured by Islamic State two years ago in Iraq and neighboring Syria.

The United Nations cited reports on Tuesday that Islamic State, which is also known as ISIL, is attempting to displace Hammam al-Alil’s estimated population of 25,000 for use as human shields and protection against air and artillery strikes.

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