KINSHASA, Nov 24 (Reuters) - U.N. investigators have found a mass grave in an army camp in Congo's eastern Ituri district containing around 30 bodies, including women and children, who appeared to have been executed, a spokesman said on Friday. "Our human rights division followed up on information it received and has confirmed a mass grave of about 30 people," Kemal Saiki, spokesman for the U.N. mission in Democratic Republic of Congo, told Reuters.