US Air Force Colonel John Dorrian says there are now about 450 coalition advisers in Iraq.
Dorrian says an unspecified number of those advisers have been inside Mosul occasionally as part of the expanding effort to support Iraqi security forces as they fight dug-in militants.
The advisers aren't involved in direct combat, but are meant to provide specialized support such as analysis of intelligence.
The Pentagon says there are 4,935 US troops in Iraq, including trainers and other support forces.
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