In this Tuesday, June 5, 2012 file photo, former presidential hopeful Mohamed ElBaradei, a one-time head of the International Atomic Energy Agency, is surrounded by supporters upon his arrival at Cairo airport, Egypt. Arabic on the banners reads, "ElBaradei is the president of consciousness republic." Watching the events in Tunisia, where a leading anti-Islamist politician was recently assassinated, members of Egypt's liberal opposition are fearfully asking, Could it happen here too? There are reasons for concern: Hardline clerics have called for the killing of opposition leaders, and activists say there are worrying signs that show the ruling Islamists are targeting their ranks _ disappearances of activists from protests and telephone death threats. With Islamists convinced the opposition is trying to overthrow President Mohammed Morsi, there is fertile ground for violence. (AP Photo/Amr Nabil, File)

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