LAHORE Amid tight security, the four-day annual Tableeghi Ijtema, the second largest Muslims congregation after Hajj pilgrimage in Saudi Arabia, will begin on Thursday at Raiwind. Hundreds of thousands of Muslims from all across the world are expected to attend the congregation, as the participants in large numbers have started arriving at the site of Raiwind. This year the congregation has been divided into two phases. The congregation in first phase will commence from Dec 2 to 5 while the second session will begin from December 9 to 12. Thousands of policemen besides and volunteers have been out on their toes to thwart any possible terror attempt. A great number of ulema from Pakistan, India, UK and other countries would deliver special sermons and offer prayers for the Muslim Ummah during congregation to be continued for four consecutive days.