Iraqi pro-government fighters celebrate as they advance into Tikrit, 160 kms north of Baghdad, during a military operation to regain the city from jihadists from the Islamic state (IS) group, on March 11, 2015. Iraqi forces entered a northern neighbourhood of Tikrit, marking a new stage in the operation launched 10 days ago to wrest the city back from jihadists, army officers said . AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
