KOLKATA, 11 APRIL: Tremors felt in several districts of the state due to an earthquake, measuring 8.5 on the Richer scale, that hit off the western coast of northern Sumatra, triggered panic in the city and caused people to evacuate their workplaces and houses and come out on the streets. As office windows and doors started rattling, and several news channels flashed visuals of cracks in various buildings, people in the office areas of Park Street, Dharamtalla, Sector V in Salt Lake and BBD Bag, left their work and rushed out of their offices. “I was calling a customer when my chair shook.