There have been numerous incidents during the Hajj, the Muslim pilgrimage to the cities of Mecca and Medina, that have caused loss of life. Every follower of Islam is required to visit Mecca and Medina during the Hajj at least once in their lifetime, if able to do so; according to Islam, the pilgrimage is one of the Five Pillars of Islam. During the month of the Hajj, Mecca and Medina must cope with as many as three million pilgrims.

On 3 July 1990, 1,426 people were suffocated and trampled to death in a crowd crush or stampede event in a tunnel near Mecca during the Hajj.