A worshipper walks on her knees at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. Every year on May 12 and 13 tens of thousands of Catholic believers go on pilgrimage to the Fatima sanctuary to pray and attend masses where the apparitions of the Virgin Mary were witnessed by three shepherd children Lucia, Jacinta and Francisco in 1917. (Photo by Francisco Seco/AP Photo)

Nuns pray on their knees at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

Worshippers release doves during a mass at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

Worshippers attend a mass at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

A child holds a candle in the Candles Procession during the annual 13th May pilgrimage to Fatima Sanctuary, Fátima, Portugal, 12 May 2015. (Photo by Paulo Novais/EPA)

Worshippers pray during a candle light vigil at the Our Lady of Fatima shrine, in Fatima, central Portugal, Tuesday, May 12, 2015. (Photo by Francisco Seco/AP Photo)

The image of Our Lady is transported among the faithfull in the Candles Procession during the annual 13th May pilgrimage to Fatima Sanctuary, Fatima, Portugal, 12 May 2015. (Photo by Paulo Novais/EPA)

Faithfuls from around the world carry religious standards as they walk to the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

A worshipper attends a mass at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

Worshippers attend a mass at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

A worshipper wearing a kerchief with the image of the Our Lady of Fatima attends a mass at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

Worshipper throw flower petals at the statue of the Our Lady of Fatima as it is carried at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)

A worshipper is helped as she walks on her knees at the Our Lady of Fatima shrine, in Fatima, central Portugal, Wednesday, May 13, 2015. (Photo by Francisco Seco/AP Photo)