Report from IndiaTVNews.com says 2 children in a railway station uncovered a bag, unzipped it, then the bag which had a bomb attached, detonated, injuring them, the events occurring in a municipality called Dum Dum, an area nearly northeast of Kolkata.
Source updated January 10th 2015 : http://www.indiatvnews.com/news/india/west-bengal-bomb-blast-near-dumdum-railway-station-3-injured-46175.html
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