Investors march during a protest as they block a road in front of the Dhaka stock exchange in Dhaka February 6, 2011. Angry investors took to the streets of the Bangladeshi capital on Sunday after the national stock exchange suffered another dramatic fall, in the latest of a series of collapses that forced trading to halt several times last month. REUTERS/Andrew Biraj (BANGLADESH - Tags: CIVIL UNREST BUSINESS IMAGES OF THE DAY)