Peter's tomb, whereheprayed accompanied by the patriarchs of Catholic Oriental Churches, he proceeded through the Basilica, followed by senior clergy, back toward the square.
Benedict, 84, arrived in Cuba's southeastern city of Santiago de Cuba on Monday, later heading to the city's Basilica del Cobre whereheprayed in front of the Virgin of Charity of Cobre, a wooden statue considered to be the shrine of the island's patron saint.
U.S. investigators have been trying to determine whether Tamerlan Tsarnaev was radicalized during his stay in the Caucasus, wherehe regularly prayed at a Makhachkala mosque.