An Egyptian protester hangs a placard on his back depicting a U.S. dollar note with a picture of president Mohammed Morsi and Arabic that reads "the American spare tire," during clashes with riot police, unseen, after protesters closed down a main street and jammed the traffic flow, in Cairo, Egypt, Tuesday, March 5, 2013. In Cairo, skirmishes erupted on Tuesday between street protesters and riot police in a main street overlooking the Nile, a day after protesters set fire to police vehicles in the same area.(AP Photo/Nasser Nasser), APTOPIX