An eight-year-old boy was killed and at least nine others, including his mother, were injured in an explosion today in Kolkata's Nagerbazar area about 2 km from the airport. The blast took place in front of a four-storey building jn a natrow lane and shatterred glass and metal shutters in nearby buildings.An eight-year-old boy was killed and at least nine others, including his mother, were injured in an explosion today in Kolkata's Nagerbazar area about 2 km from the airport. The blast took place in front of a four-storey building jn a natrow lane and shatterred glass and metal shutters in nearby buildings.