Priests lower their heads to shelter from the heat as they attend a Mass celebrated by Pope Francis for Egypt's tiny Catholic community, at the Air Defense Stadium in Cairo, Saturday, April 29, 2017. Military helicopters flew overhead and police fanned out in force Saturday as Pope Francis celebrated an open-air Mass for Egypt's tiny Catholic community on the final day of a visit aimed at comforting Christians following a series of attacks by Islamic militants. (AP Photo/Nariman El-Mofty), APTOPIX