Iraqi Shiite tribesmen brandish their weapons as they gather to show their willingness to join Iraqi security forces in the fight against Jihadist militants who have taken over several northern Iraqi cities, on June 17 2014, in the southern Shiite Muslim shrine city of Najaf. Fighting erupted at the northern approaches to Baghdad Tuesday as Iraq accused Saudi Arabia of backing militants who have seized swathes of territory in an offensive the UN says threatens its very existence. AFP PHOTO/HAIDAR HAMDANIHAIDAR HAMDANI/AFP/Getty Images
