What is the Hajj pilgrimage to Mecca?

Thousands of British Muslim are in the holy city of Mecca for the annual Hajj pilgrimage.

Hajj is one of the five pillars of Islam - mandatory things all Muslims must do during their lifetime, as long as they are physically and financially able to.

Recently, there have been safety fears because of the sheer number of people crowding into Mecca.

It is estimated two million Muslims undertake Hajj each year.

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