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Caution marks Iraqi army advance against Islamic State north of Mosul

The second phase of the operation to retake Mosul, Islamic State's last major stronghold in Iraq, began on Thursday after several weeks of deadlock in the most complex operation in the country since the 2003 U.S.-led invasion. Conventional U.S. forces deploying more extensively in this phase are now visible very close to the front lines. […]

Stephen Kalin writes for Reuters:

The second phase of the operation to retake Mosul, Islamic State's last major stronghold in Iraq, began on Thursday after several weeks of deadlock in the most complex operation in the country since the 2003 U.S.-led invasion.

Conventional U.S. forces deploying more extensively in this phase are now visible very close to the front lines. They are backing Iraq's army, federal police and counter-terrorism service (CTS), whose levels of training and experience vary widely.

Since the offensive began 10 weeks ago, CTS punched into Mosul from the east and took a quarter of the city, but regular army troops like those in Sada have made slower progress advancing from the north and south, slowing the operation.