1. One of the pillars of Islamic faith, the Hajj must be carried out at least once in their lifetime by any Muslim who has the ability to do so.

2. This photograph by Adnan Hajj, a Lebanese photographer, showed thick black smoke rising above buildings in the Lebanese capital after an Israeli air raid.

3. The fifth is performing the hajj, or pilgrimage, to Makkah at least once in a lifetime.

4. An Indian Hajj pilgrim holds prayer beads prior to his departure for Mecca at the Sardar Vallabhbhai Patel International Airport in Ahmedabad, India on October 26, 2010.

5. Yesterday marked the start of the Hajj, the annual Muslim pilgrimage to Mecca, Saudi Arabia.

6. The Hajj, the fifth pillar of Islam and one of the largest religious pilgrimages in the world, is currently taking place in Mecca, Saudi Arabia.

7. The Tajik hajj uniform is embroidered with the country's symbols, possibly the nation's flag or coat of arms, religious officials said.

8. But they highlight the Hajj in Saudi Arabia — one of the world's largest annual pilgrimages — as an example of where the introduction of traffic and safety rules has successfully prevented stampedes.

9. With Hajj and Umrah season already started, the Kingdom of Saudi Arabia has issued vaccination requirements for travellers (all ages) for Umrah and Hajj.

10. For a Muslim the hajj is the ultimate act of worship.

11. And women on the hajj — even those who wear chadors at home — are forbidden to cover their faces.

12. The Hajj pilgrimage draws millions of Muslims from around the world every year to Mecca, the birthplace of the Prophet Muhammad, Islam's holiest place.

13. Mecca, lies in the arid region of Hejaz, Western Saudi Arabia. It's the starting point for every Hajj.

14. The "spring rush", as it is called, is the largest annual movement of people in the world, with a total of 2.38bn journeys over three weeks, surpassing even the Hajj, the Muslim pilgrimage to Mecca.

15. The Kingdom of Saudi Arabia last month issued polio vaccination requirements for travellers to the Hajj.

16. Yemenis shop at a market in Sanaa on November 3 2011 in preparation for the Eid al-Adha feast or Feast of Sacrifice which marks the end of the annual hajj pilgrimage for Muslims worldwide.

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17. " I tell my friends, " he laughs , " that I've made the hajj twice.

18. Muslim pilgrims leave from Mina valley, near the holy city of Mecca, after casting pebbles at pillars as part of the hajj ritual of 'Jamarat', the symbolic stoning of Satan.

19. He now commands rebels in Zintan, using the name Hajj Usama.

20. After touring Africa and the Middle East for two months, during which he made the hajj, he returned to Harlem an orthodox Muslim, a man in flux.

21. The country has 76 health facilities staffed for the hajj, and intensive-care units have been expanded.

22. Thousands of camels are slaughtered every year during the hajj pilgrimage -- hence the need for imports.

23. The Saudi Press Agency said that a record number of Muslims were expected to make the Hajj this year - over 3.4 million anticipated over the five days of the pilgrimage.

24. Muslim pilgrims go around the Kaaba in the Grand Mosque in the holy city of Mecca after morning prayers before the start of the hajj pilgrimage November 24, 2009.

25. The repeat patterns in the smoke made lots of people smell a rat and it turned out that Hajj had even copied some of the buildings.