In this Tuesday, May 12, 2015 photo, boys wearing hats that read in Arabic “My love, oh the prophet of Allah” pose for a photo while riding on a carousel, as Muslims take part in a religious festival, or moulid, which commemorates the birth of the Muslim Prophet Muhammad's granddaughter, Sayyeda Zeinab, outside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Mosa'ab Elshamy/AP Photo)

In this photo taken Tuesday, May 12, 2015, an Egyptian decorates the shrine of Sayyeda Zeinab with flowers, as hundreds celebrates a religious festival, or Moulid, which commemorates of the birth of Muslim Prophet Muhammad's granddaughter Sayyeda Zeinab, inside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Amr Nabil/AP Photo)

In this photo taken Tuesday, May 12, 2015, an Egyptian Sufi Muslim waves a green flag with Arabic that reads, “There is no God but Allah and Muhammad is his messenger” as he welcomes visitors to the Sayyeda Zeinab mosque. Egyptian Muslims celebrate the religious festival, or Moulid, which commemorates the birth of the Muslim Prophet Muhammad's granddaughter, Sayyeda Zeinab, outside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Amr Nabil/AP Photo)

In this photo taken Tuesday, May 12, 2015, people ride on a carousel as they celebrate a religious festival, or moulid, which commemorates of the birth of Muslim Prophet Muhammad's granddaughter Sayyeda Zeinab, outside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Amr Nabil/AP Photo)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

People walk in front of Sayida Zeinab mosque as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

A father and his daughter rides a swing as people celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians reach to touch the shrine of Sayida Zeinab as people celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, in Cairo, May 12, 2015. Picture taken May 12, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

People buy masks and hats in front of Sayida Zeinab mosque as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

Egyptians dance to the music of a Sufi singer as they celebrate the birthday of Sayida Zeinab, the granddaughter of Prophet Mohammad, near her shrine in Cairo, May 13, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

In this Tuesday, May 12, 2015 photo, people ride swing, as Muslims take part in a religious festival, or moulid, which commemorates the birth of the Muslim Prophet Muhammad's granddaughter, Sayyeda Zeinab, in a street outside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Mosa'ab Elshamy/AP Photo)

In this Tuesday, May 12, 2015 photo, families ride a swing as Muslims take part in a religious festival, or moulid, which commemorates the birth of the Muslim Prophet Muhammad's granddaughter, Sayyeda Zeinab, outside the mosque and shrine named for her, in Cairo, Egypt. (Photo by Mosa'ab Elshamy/AP Photo)