U.S. citizen Moustafa Kassem was arrested amid a massive crackdown on sit-ins in Cairo in Aug. 2013. Police are shown arresting men as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi.

U.S. citizen Moustafa Kassem was arrested amid a massive crackdown on sit-ins in Cairo in Aug. 2013. Police are shown arresting men as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi.

U.S. citizen Moustafa Kassem was arrested amid a massive crackdown on sit-ins in Cairo in Aug. 2013. Police are shown arresting men as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi.

U.S. citizen Moustafa Kassem was arrested amid a massive crackdown on sit-ins in Cairo in Aug. 2013. Police are shown arresting men as they clear a sit-in by supporters of ousted Islamist President Mohammed Morsi.