Peter's Square

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Pope Francis delivers his message on the occasion of an audience with participants of Rome's diocese convention in St. Peter's Square, at the Vatican, Sunday, June 14, 2015. Francis engaged in some self-promotion during his weekly blessing, alerting the thousands of people in St. Peter's Square that his first solo encyclical is coming out on Thursday and inviting them to pay attention to environmental degradation around them. (AP Photo/Gregorio Borgia)

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Pope Francis delivers a blessing during the Angelus noon prayer he delivered from his studio's window, in St. Peter's Square, at the Vatican, Sunday, July 19, 2015. (AP Photo/Gregorio Borgia)

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Pope Francis waves to the faithful as he arrives for his weekly general audience, in St. Peter's Square, at the Vatican in this June 24, 2015, file photo. (AP Photo/Riccardo De Luca, File)

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Pope Francis waves as he arrives for his weekly general audience, in St. Peter's Square at the Vatican, Wednesday, June 17, 2015. (AP Photo/Andrew Medichini)

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Pope Francis delivers his message on the occasion of an audience with participants of Rome's diocese convention in St. Peter's Square, at the Vatican, Sunday, June 14, 2015. (AP Photo/Gregorio Borgia)

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Pope Francis blesses the faithful as he arrives on the occasion of an audience with participants of Rome's diocese convention in St. Peter's Square, at the Vatican, Sunday, June 14, 2015. (AP Photo/Gregorio Borgia)

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Pope Francis delivers a blessing during the Angelus prayer in St. Peter's Square, at the Vatican, Sunday, June 7, 2015. (AP Photo/Gregorio Borgia)

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Pope Francis waves to faithful during his weekly general audience, in St. Peter's Square, at the Vatican in this May 20, 2015, file photo. (AP Photo/Andrew Medichini, File)

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Pope Francis ;eaves at the end of his weekly general audience in St. Peter's Square at the Vatican, Wednesday, May 13, 2015. (L'Osservatore Romano/Pool Photo via AP)

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Pope Francis arrives for his weekly general audience in St. Peter's Square at the Vatican, Wednesday, May 13, 2015. (AP Photo/Alessandra Tarantino)

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Pope Francis briefly spun a basketball on his finger in a rare sight Wednesday as the Harlem Globetrotters visited St. Peter's Square. (Fox News video screenshot)

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Italian police officers patrol outside St. Peter's Square in Rome. Islamic extremists suspected in a bomb attack in a Pakistani market that killed more than 100 people had also planned an attack against the Vatican in 2010 that was never carried out, an Italian prosecutor said Friday. (Associated Press) ** FILE **