2.5 million pack Buenos Aires boulevard for Pope Leo Mass

An estimated 2.5 million people filled a main boulevard in Buenos Aires on Monday for an outdoor Mass led by Pope Leo, in what officials described as a record crowd and the biggest event so far of his South America trip. Pilgrims lined Avenida del Libertador for miles, waving Vatican flags and waiting overnight for a view of the pope as he rode through the city in an open-top popemobile. Leo, 71, used his sermon to celebrate the strength of Catholic faith in the region. The Argentina visit is the first papal trip to the country in nearly four decades and comes less than a month after Leo underwent lung cancer surgery.