This frame grab from video provided by the Lebanese Army official website, a Lebanese army tank fires during a battle against Islamic State militants, on the outskirts of Ras Baalbek, northeast Lebanon, Sunday, Aug. 20, 2017. Sunday's gains come a day after the U.S.-backed army launched its biggest military operation yet against IS, who in 2014 gained a foothold along the tiny Mediterranean country's border with Syria. The Arabic Hashtag reads, "The Barren Mountains Dawn." (Lebanese Army Website via AP)
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