Millions of Muslims begin gathering in the holy city of Mecca

Muslim pilgrims circle the Kaaba, the cubic building at the Grand Mosque in the Muslim holy city of Mecca, Saudi Arabia, Tuesday, Sept. 15, 2015. Despite the crane accident on Friday, almost one million pilgrims have arrived as of Tuesday ahead of the hajj. (AP Photo/Mosa'ab Elshamy)

Millions of Muslims are starting to gather in Mecca, Saudi Arabia for the Hajj set to start on the 9th of september.

The Hajj is one of the five pillars of Islam, and faithful Muslims are required to complete the journey at least once in their lifetime — if they are physically and financially able to do so.

CCTV’s Adel EL Mahrouky is in the holy city, and filed this story.