An airstrike rips through a suspected militant hideout in Marawi on Friday. The U.S. is now providing "technical assistance" in the fight to retake the city, according to a Philippine military spokesman. Noel Celis/AFP/Getty Images hide caption

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Noel Celis/AFP/Getty Images

Philippine army Scout Rangers crouch in a classroom during a mission to flush out militant snipers in Marawi on Tuesday. Using these snipers, human shields and their knowledge of the city, the ISIS-linked militants have continued to maintain their grasp on parts of the city. Noel Celis/AFP/Getty Images hide caption

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Noel Celis/AFP/Getty Images