The United States will maintain its presence in eastern Syria and will take measures necessary to prevent a resurgence of Islamic State, Deputy Assistant Secretary of Defense for the Middle East Daniel Shapiro said on Sunday. Speaking hours after Syrian rebels announced they had toppled Bashar al-Assad’s government, Shapiro called on all parties to protect civilians, particularly minorities, and to respect international norms. “We are aware that the chaotic and dynamic circumstances on the ground in Syria could give ISIS space to find the ability to become active, to plan external operations, and we’re determined to work with those partners to continue to degrade their capabilities,” he told the Manama Dialogue security conference in Bahrain’s capital.