Peter's tomb, where he prayed accompanied by the patriarchs of Catholic Oriental Churches, he proceeded through the Basilica, followed by senior clergy, back toward the square.

CNN: March 19, 2013 -- Updated 0829 GMT (1629 HKT)

Benedict, 84, arrived in Cuba's southeastern city of Santiago de Cuba on Monday, later heading to the city's Basilica del Cobre where he prayed in front of the Virgin of Charity of Cobre, a wooden statue considered to be the shrine of the island's patron saint.

CNN: Pope's Havana visit raises questions of whom he'll meet

U.S. investigators have been trying to determine whether Tamerlan Tsarnaev was radicalized during his stay in the Caucasus, where he regularly prayed at a Makhachkala mosque.

NPR: Boston Suspects' Father Says He's Returning To US