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Philippine soldiers walk past Islamic State (IS) group graffiti in Marawi on the southern island of Mindanao on May 31, 2017, as fighting between government forces and Muslim militants rages on the ninth day.
Philippine security forces have killed 89 Islamist militants during more than a week of fighting in a southern city but the gunmen are still offering strong resistance and holding hostages, the military said on May 31. / AFP PHOTO / TED ALJIBE        (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine soldiers walk past Islamic State (IS) group graffiti in Marawi on the southern island of Mindanao on May 31, 2017, as fighting between government forces and Muslim militants rages on the ninth day.
Philippine security forces have killed 89 Islamist militants during more than a week of fighting in a southern city but the gunmen are still offering strong resistance and holding hostages, the military said on May 31. / AFP PHOTO / TED ALJIBE        (Photo credit should read TED ALJIBE/AFP/Getty Images)

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How ISIS established a foothold in Philippines

CNN's Ivan Watson explores how decades of extremist activity in Southeast Asia allowed ISIS militants to gain a foothold in the Philippines.