The world's largest annual religious pilgrimage has begun, as 2.5m Muslims arrive at the holy city of Mecca for the hajj.
A rare rainstorm and possible banned protests by Iranian pilgrims threatened to mar the four-day hajj, but Saudi officials said they were prepared for all eventualities.
A sea of pilgrims from all over the world, dressed in flowing white robes, surrounded the kaaba shrine inside Mecca's Grand Mosque for dawn prayers today.
Four pilgrims, all of them already suffering from other health problems, have died from swine flu ahead of the official start of hajj rites.
But proven and suspected infections from the A(H1N1) flu amid hajj participants only number 67.
The flu has killed some 6,750 people around the world this year, the WHO said on Friday, and Saudi authorities have deployed as many as 20,000 health workers to deal with major outbreaks during the hajj.
Amid a war of words between Riyadh and Tehran over predominantly Sunni Muslim Saudi Arabia's treatment of Iran's mainly Shia pilgrims, sources in the Iranian delegation said they would undertake a ritual protest in their own camp in the massive pilgrims' tent city in Mina valley.
Traffic was jammed around Mecca yesterday as hundreds of thousands of latecomers arrived in the western Saudi Arabia city to launch into the rites of the hajj, required for all able Muslims at least once in their lifetime.
The rites begin with the 'tawaf', the circling seven times of the cubic Kaaba building in the centre of the massive, one-million-person capacity Grand Mosque, in whose direction all Muslims around the world pray.
Pilgrims then proceed to Mina to spend the night before climbing Mount Arafat, near where Islam's prophet Mohammed gave his final sermon, to recite the Koran and pray.
Possible flooding from a rainstorm Wednesday could complicate the movement of so many people, with drainage systems limited in normally parched Saudi Arabia.
Flooding in the Mina tent city ‘would be a catastrophe,’ said Karim Saleh, 34, a pilgrim from Qatar.
Authorities were expecting about 2m foreigners this year for the annual pilgrimage.
The number of pilgrims from inside the kingdom, which can top 500,000, is expected to be sharply down this year due to fears about the flu.
