Cairo - Pope Francis is leading Mass at a military-run stadium in Cairo with at least 10,000 Egyptian Catholics in attendance amid tight security, including helicopters hovering over the suburban facility. The Saturday Mass is being held on the second and final day of a historic visit to Egypt by the Catholic pontiff, who came to the Muslim majority Arab nation to forge a united Christian-Muslim front against religious militancy and lift the spirits of Egypt's Christians after a spate of deadly attacks against their churches in December and earlier this month. The atmosphere at the June 30 stadium was cheerful, with members of the congregation swaying to hymns sung by church choirs and waving Egyptian and Vatican flags. Others held yellow balloons, the color of the Vatican flag.