Violent clashes took place between revolutionary groups and members of the Muslim Brotherhood in Egypt's Tahrir square on Friday, October 12. Today's Friday protest was planned a week ago by revolutionary movements and some political parties against president Morsi's unfulfilled promises in his first 100 days in office and against the acquittal of all defendants in the cases related to the killing of protesters in the revolution. The Muslim brotherhood made a last minute decision to join the protests. The clashes started as members of the Muslim brotherhood attacked some of protesters in the square for chanting against Morsi, they destroyed their stage and chased them until they ran out of the square. The situation escalated as revolutionary movements arrived at the square to protect the attacked protesters. Clashes involved rocks throwing and Molotov cocktails. Birdshot pellets were shot from the Muslim brotherhood side. The square turned into a battle field where hundreds were injured. Each group tried to occupy the square. The situation calmed down as members of the Muslim brotherhood withdrew from the square. This is the first major violent clash between revolutionary youth and the Muslim brotherhood since the beginning of the revolution.