It was the latest confirmation that the Islamists, who have dominated elections since Mr. Mubarak’s ouster, have inherited not only his presidential palace but also the blame for Egypt’s myriad problems. 
On Friday, five months after President Mohamed Morsi of the Brotherhood’s political party took power from Egypt’s interim military rulers, the demonstrators’ main complaint was that the Islamists had failed to fulfill the social welfare and social justice demands of the original revolt. A banner in the center of the square called for the repeal of the Islamist-backed Constitution, passed in a referendum last month, which opponents say failed to enshrine ironclad guarantees of individual freedoms.
“The Egyptian people had so many dreams and the reality on the ground is, everything is still the same,” said Mohamed Adl, 41, a teacher who carried a sign with a handwritten poem blaming the Brotherhood for making “injustice the guard of our lives.”
By early afternoon in Cairo, a few dozen protesters at one corner of the square — many of them apparently teenagers — had begun to throw rocks over a cement barrier at security forces massed around the Interior Ministry building, resuming an intermittent battle that had begun the day before in anticipation of the anniversary. The security officers, as they typically do, threw back some of the rocks, and plumes of tear gas sailed overhead past a church steeple up the street.
State media reported at around 3 p.m. that four people had been injured in the clashes with security forces near the square, in addition to 25 injured since the battle began the day before.