ISIS is continuing to attempt to reinforce its defenses of Mosul. If those defenses grow to a significant level, then Iraqi forces may need U.S. help in locating military targets to hit, the official said.
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However, hostage killings videos do underscore that the ISIS social media propaganda campaign remains strong, the official said. U.S. military and intelligence officials are noting the highly produced nature of some of the videos indicate ISIS had spent considerable time on the efforts.
