The operation on suspected Daesh militants came after the boldest attacks by the terrorists in recent weeks that killed a guard and 11 Iraqi soldiers earlier this month.
Daesh militants still conduct operations, often targeting security forces, power stations and other infrastructure in northern Iraq.
As the city of Mosul tries to recover from war, doctors are warning of a new catastrophe: infectious and water-borne diseases.
Iraqi troops began an offensive to drive out Daesh militants from Rawa, the last stronghold of the group in the Iraqi western border with Syria.
CTS says it could take at least four to five days of fighting to capture the last handful of neighbourhoods along the banks of the Tigris River.
US-backed Iraqi forces encircled a mosque in Mosul's Old City where Daesh leader Abu Bakr al-Baghdadi declared a self-style "caliphate" in 2014.
The offensive to retake the Old City was launched on Sunday but progress has been slow as Iraqi forces encounter stiff resistance from Daesh members.
High level Syrian regime forces' delegation holds talks with Iraqi counterparts in Baghdad on border security in the first public visit of its kind in years to coordinate the fight against Daesh.
The UN says it is "deeply concerned" for the safety of civilians as a final assault to retake Mosul from Daesh looks imminent.
Iraqi forces say Daesh now controls only a few districts in the western half of Mosul, including the Old City.
Daesh has now been dislodged from all but a handful of districts in the western half of Mosul including the Old City, Iraqi forces say.
The Peshmerga forces, based in the northern city of Kirkuk, say they have been waiting for the Iraqi army to finish its operations in Mosul first. But critics say the Peshmerga have been delaying their attack for political reasons.
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