In this Jan. 23, 2011 photo, a vendor, center, foreground, and a man jump from the top of one overcrowded train to another as thousands of Bangladeshi Muslims try to return home after attending the three-day Islamic Congregation on the banks of the River Turag in Tongi, outskirts of Dhaka, Bangladesh. The congregation, held each year since 1966, is among the world's largest religious gatherings.