Egyptian army soldiers and tanks are positioned in front of anti-government demonstrators, to prevent clashes between Mubarak supporters, unseen, and anti-government protesters who shelter behind makeshift barricades, in Tahrir square, Cairo, Egypt, Saturday, Feb. 5, 2011. Rallies in Cairo and behind-the-scenes diplomacy from the U.S. President Barack Obama administration is piling more pressure on Egyptian President Hosni Mubarak to make a swift exit and allow a temporary government to embark on an immediate path toward democracy. (AP Photo/Lefteris Pitarakis)