Saudi Arabia has barred more than 269,000 people without permits for the annual Hajj pilgrimage from entering Mecca this week, authorities said, as the world's largest annual gathering of people has officially begun.

A Saudi government spokesperson says more than 1.5 million foreign pilgrims are in the country for this year's Hajj.

Millions will make the annual pilgrimage to Mecca. The kingdom faces scrutiny over safety after more than 1,300 people died last year.