Iraqi fighters from the Saraya al-Salam (Peace Brigades), a group formed by Iraqi Shiite Muslim cleric Moqtada al-Sadr, wave their weapons as they leave the holy city of Najaf in a convoy with Iraqi government forces to head to the northern Iraqi city of Tikrit to continue the offensive against Islamic State (IS) group jihadists to retake to city on March 20, 2015. The offensive to push back IS militants from Tikrit began on March 2, and Iraqi forces have only recently reached the city limits where they have been stalled by bombs and entrenched fighters. AFP PHOTO / HAIDAR HAMDANI        (Photo credit should read HAIDAR HAMDANI/AFP/Getty Images)