Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Visitors sit on the roof of hotel outside the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

A Muslim reads the Koran during Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017 (Reuters)

Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Muslims wait to cross into the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Muslims wait to cross into the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017. (Reuters)

Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017 (Reuters)

Muslims attend Friday prayers at the Grand mosque ahead of the annual Haj pilgrimage, in Mecca, Saudi Arabia August 25, 2017 (Reuters)