Men dug up pavement in order to throw rocks at the opposing side, and after night fell, gunshots were heard and Molotov cocktails were thrown.RELATED:Reporter's Notebook: Coffee and politics in Cairo Eyewitness: The people against the policeTanks separate, clear protesters from Tahrir SquareOn Tuesday night, Egyptians demonstrated as Mubarak announced that he would not seek re-election, demanding that he resign immediately.