Three Katyusha rockets landed in Baghdad’s Green Zone on Saturday night, just hours after fierce clashes between demonstrators and the security forces that resulted in the killing of four protesters and one security members, an Interior Ministry source said. The rocket are believed to be launched from Baghdad eastern neighborhoods of Baladiyat and Palestine Street, which both are strongholds of followers the influential Shiite cleric Moqtada al-Sadr, the source told Xinhua on condition of anonymity.