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Pope Francis speaks next to Brazil's President Dilma Rousseff during a welcoming ceremony for him in Guanabara Palace in Rio de Janeiro, July 22, 2013. Pope Francis touched down in Rio de Janeiro on Monday, starting his first foreign trip as pontiff and a weeklong series of events expected to attract more than a million people to a gathering of young faithful in Brazil, home to the world's largest Roman Catholic population. Picture taken July 22, 2013. REUTERS/Osservatore Romano/Handout via Reuters ( BRAZIL-POPE/ )

Faithfuls wait at Copacabana beach in Rio de Janeiro, Brazil, on July 23, 2013 for the start of the holy mass that will officially open World Youth Day (WYD). The highlight of the landmark visit of Pope Francis to the world's most populous mainly Catholic country will be World Youth Day, a five-day event that kicks off today. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his arrival on Monday. TASSO MARCELO/AFP/Getty Images ( 521575419 )

RIO DE JANEIRO, BRAZIL - JULY 23: Young pilgrims from Argentina perform a flip for a friend taking photos on Copacabana Beach as they await the start of opening ceremonies for World Youth Day celebrations on July 23, 2013 in Rio de Janeiro, Brazil. More than 1.5 million pilgrims are expected to join Pope Francis for his visit to the Catholic Church's World Youth Day celebrations. Pope Francis will deliver his welcome address to the celebrations on July 25 as World Youth Day runs July 23-28. (Photo by Mario Tama/Getty Images) ( 174291552 )

Youth from France participating in World Youth Day sing songs below Christ the Redeemer statue in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. The pope is here on a seven-day visit meant to fan the fervor of the faithful around the globe. (AP Photo/Jorge Saenz) ( APTOPIX Brazil Pope World Youth Day )

Catholics kneel at portable confessionals set up in Quinta da Boa Vista park during World Youth Day events in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. The pope is here on a seven-day visit meant to fan the fervor of the faithful around the globe. (AP Photo/Silvia Izquierdo) ( APTOPIX Brazil Pope World Youth Day )

Young pilgrims confess at the Quinta da Boa Vista park in Rio de Janeiro, Brazil on July 23, 2013. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his landmark visit during the World Youth Day (WYD) to Rio de Janeiro. VANDERLEI ALMEIDA/AFP/Getty Images ( 521573021 )

People wearing U.S. flags kneel at portable confessionals set up in Quinta da Boa Vista park during World Youth Day events in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. The pope is here on a seven-day visit meant to fan the fervor of the faithful around the globe. (AP Photo/Silvia Izquierdo) ( Brazil Pope World Youth Day )

A man lights a candle at the Basilica and National Sanctuary of Our Lady of Aparecida -which will be visited by Pope Francis Wednesday- in Aparecida, Sao Paulo state, Brazil on July 23, 2013. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his landmark visit during the World Youth day (WYD) to Rio de Janeiro. NELSON ALMEIDA/AFP/Getty Images ( 521570302 )

Religious statuettes are displayed for sale in the downtown of Aparecida, Sao Paulo state, Brazil on July 23, 2013. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his landmark visit during the World Youth day (WYD) to Rio de Janeiro. On Wednesday, he will visit the Shrine of Our Lady of Aparecida in Sao Paulo state, where the explosive was discovered on Sunday. NELSON ALMEIDA/AFP/Getty Images ( 521568952 )

Roque Steves, dressed in the likeness of the pope, waves to members of security and the press as he arrives to the Sumare residence where Pope Francis is staying in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. Steves said he is a social worker who caters to the poor, and his outfit was his way of calling attention to charity work. The pope is in Brazil on a seven-day visit meant to fan the fervor of the faithful around the globe. (AP Photo/Silvia Izquierdo) ( APTOPIX Brazil Pope World Youth Day )

Thousands of young pilgrims gather on Copacabana Beach for a World Youth Day Mass in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day festival. (AP Photo/Jorge Saenz) ( Brazil Pope )

Thousands of youths celebrates before a mass during World Youth Day in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day festival. (AP Photo/Jorge Saenz) ( Brazil Pope )

Catholic faithfuls carry the World Youth Day (WYD) Cross that in 1984 Pope John Paul II entrusted the youth of the world, to the stage before the start of the WYD opening mass, at Copacabana beach in Rio de Janeiro, Brazil, on July 23, 2013. The highlight of the landmark visit of Pope Francis to the world's most populous mainly Catholic country will be WYD, a five-day event that kicks off today. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his arrival on Monday. TASSO MARCELO/AFP/Getty Images ( 521577149 )

Thousands of young pilgrims gather on Copacabana Beach for a World Youth Day Mass in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. As many as 1 million young people from around the world are expected in Rio for the Catholic youth event. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day. (AP Photo/Jorge Saenz) ( APTOPIX Brazil Pope )

RIO DE JANEIRO, BRAZIL - JULY 23: Pilgrim Alan Abujamra da Cunha (C), from Sao Paulo, attends Mass at opening ceremonies for World Youth Day while watching a live video broadcast of the ceremonies on Copacabana Beach on July 23, 2013 in Rio de Janeiro, Brazil. Video screens have been set up along the beach to accomodate the throngs attending. More than 1.5 million pilgrims are expected to join Pope Francis for his visit to the Catholic Church's World Youth Day celebrations. Pope Francis will deliver his welcome address to the celebrations on Copacabana Beach on July 25 as World Youth Day runs July 23-28. (Photo by Mario Tama/Getty Images) ( 174298489 )

Clergy stand during a World Youth Day Mass at Copacabana beach, in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. As many as 1 million young people from around the world are expected in Rio for the Catholic youth event. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day festival. (AP Photo/Silvia Izquierdo) ( Brazil Pope )

Clergy ascend an altar at the start World Youth Day Mass at Copacabana beach, in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. As many as 1 million young people from around the world are expected in Rio for the Catholic youth event. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day festival. (AP Photo/Silvia Izquierdo) ( Brazil Pope )

Pilgrims hold onto the World Youth Day Cross or Pilgrim Cross, given to the youth by the late Pope John Paul II, during a Mass at Copacabana beach, in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. As many as 1 million young people from around the world are expected in Rio for the Catholic youth event. Pope Francis arrived in Rio de Janeiro on Monday to begin a weeklong visit to participate in the World Youth Day festival. (AP Photo/Silvia Izquierdo) ( APTOPIX Brazil Pope )

A woman looks out a window during the World Youth Day inauguration ceremony in Rio de Janeiro, July 23, 2013. Pope Francis touched down in Rio de Janeiro on Monday, starting his first foreign trip as pontiff and a weeklong series of events expected to attract more than a million people to a gathering of young faithful in Brazil, home to the world's largest Roman Catholic population. REUTERS/Stefano Rellandini ( POPE-BRAZIL/ )

RIO DE JANEIRO, BRAZIL - JULY 23: Young pilgrims attend Mass at opening ceremonies for World Youth Day while watching a live video broadcast of the ceremonies on Copacabana Beach on July 23, 2013 in Rio de Janeiro, Brazil. Video screens have been set up along the beach to acommodate the throngs attending. More than 1.5 million pilgrims are expected to join Pope Francis for his visit to the Catholic Church's World Youth Day celebrations. Pope Francis will deliver his welcome address to the celebrations on Copacabana Beach on July 25 as World Youth Day runs July 23-28. (Photo by Mario Tama/Getty Images) ( 174299719 )

Catholic faithfuls pray as the World Youth Day (WYD) Cross that in 1984 Pope John Paul II entrusted the youth of the world, arrives at the stage before the start of the WYD opening mass, at Copacabana beach in Rio de Janeiro, Brazil, on July 23, 2013. The highlight of the landmark visit of Pope Francis to the world's most populous mainly Catholic country will be WYD, a five-day event that kicks off today. Pope Francis's popularity on his Latin American home turf posed a challenge to Brazilian authorities Tuesday after adoring crowds mobbed his car on his arrival on Monday. TASSO MARCELO/AFP/Getty Images ( 521577163 )

A Bishop takes a picture during the World Youth Day inauguration ceremony in Rio de Janeiro July 23, 2013. Pope Francis touched down in Rio de Janeiro on Monday, starting his first foreign trip as pontiff and a weeklong series of events expected to attract more than a million people to a gathering of young faithful in Brazil, home to the world's largest Roman Catholic population. REUTERS/Stefano Rellandini ( POPE-BRAZIL/ )

Pilgrims attend the World Youth Day inauguration ceremony in Rio de Janeiro July 23, 2013. Pope Francis touched down in Rio de Janeiro on Monday, starting his first foreign trip as pontiff and a weeklong series of events expected to attract more than a million people to a gathering of young faithful in Brazil, home to the world's largest Roman Catholic population. REUTERS/Stefano Rellandini ( POPE-BRAZIL/ )

RIO DE JANEIRO, BRAZIL - JULY 23: A young pilgrim bows his head in prayer while wearing rain gear and attending Mass at opening ceremonies for World Youth Day on Copacabana Beach on July 23, 2013 in Rio de Janeiro, Brazil. More than 1.5 million pilgrims are expected to join Pope Francis for his visit to the Catholic Church's World Youth Day celebrations. Pope Francis will deliver his welcome address to the celebrations on Copacabana Beach on July 25 as World Youth Day runs July 23-28. (Photo by Mario Tama/Getty Images) ( 174300465 )

Bishops wearing plastic rain hoods attend the World Youth Day inaugural Mass on Copacabana beach, in Rio de Janeiro, Brazil, Tuesday, July 23, 2013. A cold rain Tuesday night didn't stop upward of 500,000 faithful from gathering on Rio's Copacabana beach to mark the event. (AP Photo/Domenico Stinellis) ( APTOPIX Brazil Pope )