Hundreds of protesters gathered on Saturday on Qasr al-Nil Bridge to commemorate those who were killed by security forces on 28 January — the Friday of Anger — last year. Protesters performed the afternoon prayers and then Salat al-Gha'eb, the prayer for the absent, for the martyrs. They blocked Qasr al-Nil Bridge and prevented traffic passing during prayers. Following prayers, protesters chanted "Down with the military rule," and "The people want the rights of the martyrs." They demanded fair punishments for those implicated in killing protesters. On 28 January 2011 dozens of protesters were killed on Qasr al-Nil Bridge when tens of thousands tried to enter Tahrir Square and thousands of police and security officers tried to prevent them by using live ammunition, tear gas and water cannons. After a long struggle the security forces fled and protesters managed to cross the bridge and enter the square. With clashes taking place nationwide between pro-democracy protesters and security forces, it was the bloodiest day of the uprising that began on 25 January and ousted Hosni Mubarak on 11 February. A number of protesters who have been staging a sit-in since yesterday in Tahrir Square marched around the square on a regular basis to avoid causing traffic jams. They demanded that the ruling Supreme Council of the Armed Forces hand over power to a civilian authority.