Members of Egypt\'s central security forces take position on the rooftop of a building on a street near Tahrir (Liberation) Square, where clashes  erupted with demonstrators and police fired tear gas on Saturday, Jan. 26, 2013.

Members of Egypt\'s central security forces take position on the rooftop of a building on a street near Tahrir (Liberation) Square, where clashes erupted with demonstrators and police fired tear gas on Saturday, Jan. 26, 2013.

LAURA EL-TANTAWY

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