A Muslim pilgrim prays on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, September 23, 2015 during the hajj pilgrimage. Mount Arafat, marked by a white pillar, is where Islam's Prophet Muhammad is believed to have delivered his last sermon to tens of thousands of followers some 1,400 years ago, calling on Muslims to unite. (Photo by Mosa'ab Elshamy/AP Photo)





Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim prays on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims perform prayers in Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims perform prayers in Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim girl touches the holy Kaaba at the Grand Mosque on the first day of Eid al-Adha during the annual haj pilgrimage in Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims walk on roads as they head to cast stones at pillars symbolizing Satan during the annual haj pilgrimage in Mina on the first day of Eid al-Adha, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims touch the holy Kaaba at the Grand Mosque on the first day of Eid al-Adha during the annual haj pilgrimage in Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims walk on roads as they head to cast stones at pillars symbolizing Satan during the annual haj pilgrimage in Mina on the first day of Eid al-Adha, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims touch and kiss the al-Hajr al-Aswad “Black Stone” at the Grand Mosque on the first day of Eid al-Adha in the holy city of Mecca during the annual haj pilgrimage September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque on the first day of Eid al-Adha during the annual haj pilgrimage in Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim touches the holy Kaaba at the Grand Mosque on the first day of Eid al-Adha during the annual haj pilgrimage in Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims travel on buses at Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims arrive to cast stones at pillars symbolizing Satan during the annual haj pilgrimage in Mina on the first day of Eid al-Adha, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims travel on buses at Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims cast stones at pillars symbolizing Satan, during the annual Haj pilgrimage on Eid al-Adha in Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims cast stones at pillars symbolizing Satan, during the annual Haj pilgrimage on Eid al-Adha in Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims cast stones at pillars symbolizing Satan, during the annual Haj pilgrimage on Eid al-Adha in Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





An ambulance drives on the road at camp city at Mina, near the holy city of Mecca September 24, 2015. At least 310 pilgrims were killed on Thursday in a crush at Mina, outside the Muslim holy city of Mecca, where some two million people are performing the annual Haj pilgrimage, Saudi authorities said. (Photo by Ahmad Masood/Reuters)





An ambulance drives towards the camp city at Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Pilgrims walk on a road in Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





A view of the camp city at Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Police vehicles drive past pilgrims on a road in Mina, near the holy city of Mecca September 24, 2015. (Photo by Ahmad Masood/Reuters)





Saudi police keep watch at Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims cast stones at a pillar symbolizing the stoning of Satan, in a ritual called “Jamarat”, the last rite of the annual hajj, on the first day of Eid al-Adha, in Mina near the holy city of Mecca, Saudi Arabia, Thursday, September 24, 2015. (Photo by Mosa'ab Elshamy/AP Photo)





Muslim pilgrims cast stones at a pillar symbolizing the stoning of Satan, in a ritual called “Jamarat”, the last rite of the annual hajj, on the first day of Eid al-Adha, in Mina near the holy city of Mecca, Saudi Arabia, Thursday, September 24, 2015. (Photo by Mosa'ab Elshamy/AP Photo)





Muslim pilgrims collect stones in bottles as they make their way to cast stones at a pillar symbolizing the stoning of Satan, in a ritual called “Jamarat”, the last rite of the annual hajj, on the first day of Eid al-Adha, in Mina near the holy city of Mecca, Saudi Arabia, Thursday, September 24, 2015. (Photo by Mosa'ab Elshamy/AP Photo)






Muslim pilgrims gather around bodies of people crushed in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. Hundreds were killed and injured, Saudi authorities said. The crush happened in Mina, a large valley about five kilometers (three miles) from the holy city of Mecca that has been the site of hajj stampedes in years past. (Photo by AP Photo)





Muslim pilgrims and rescuers gather around people who died in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





A muslim pilgrim walks through the site where dead bodies are gathered in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Muslim pilgrims and rescuers gather around people who were crushed by overcrowding in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Emergency services attend to victims of a crush in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Muslim pilgrims and rescue workers gather around the victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Muslim pilgrims gather around the victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Muslim pilgrims and rescuers gather around the victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Rescue workers attend to victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Rescue workers attend to victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





Emergency services attend to victims crushed in a crowd in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





A rescue worker attends to a man injured in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





The body of a Muslim pilgrim is seen after a stampede at Mina, outside the holy Muslim city of Mecca September 24, 2015. The death toll from a stampede during the annual Muslim hajj pilgrimage in Saudi Arabia on Thursday has risen to 453 people of various nationalities, the Saudi civil defence said. (Photo by Reuters/Stringer)





Muslim pilgrims and rescuers gather around the victims of a stampede in Mina, Saudi Arabia during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by AP Photo)





In this image posted on the official Twitter account of the directorate of the Saudi Civil Defense agency, a pilgrim is treated by a medic after a stampede that killed and injured pilgrims in the holy city of Mina during the annual hajj pilgrimage on Thursday, September 24, 2015. (Photo by Directorate of the Saudi Civil Defense agency via AP Photo)





Saudi medics tend to injured pilgrims after they arrived by ambulance at an emergency hospital following a deadly stampede in Mina, near the holy city of Mecca, on the first day of Eid al-Adha on September 24, 2015. (Photo by Mohammed Al-Shaikh/AFP Photo)





Saudi ambulances arrive with pilgrims who were injured in a stampede at an emergency hospital in Mina, near the holy city of Mecca, on the first day of Eid al-Adha on September 24, 2015. At least 310 people were killed and hundreds wounded during a stampede at the annual hajj in Saudi Arabia, in the second tragedy to strike the pilgrims this year. (Photo by Mohammed Al-Shaikh/AFP Photo)





Saudi policemen carry an injured pilgrim outside an emergency hospital following a deadly stampede in Mina, near the holy city of Mecca, on the first day of Eid al-Adha on September 24, 2015. (Photo by Mohammed Al-Shaikh/AFP Photo)