There have been many serious
incidents during the Hajj, the
Muslim pilgrimage to the city of
Mecca, that have caused the loss of thousands of lives. Every follower of
Islam is required to visit Mecca during the Hajj at least once in his or her lifetime, if able to do so; the pilgrimage is one of the
Five Pillars of Islam. During the month of the Hajj, Mecca must cope with as many as three million pilgrims.