Smoke billows from behind the Great Mosque of al-Nuri in Mosul's Old City on April 17, 2017, during an offensive by Iraqi security forces to recapture the city from Islamic State (IS) group fighters. / AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
U.S.-backed Iraqi troops pushed into the last Islamic State stronghold in Mosul on Sunday, an Iraqi commander said, formally launching the final major battle of an eight-month campaign to drive the militants from Iraq’s second largest city.
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