From Time Magazine:
Late-night digging along the back roads of Bastar, a dense jungle region in India's northern state of Chhattisgarh, can only mean one thing if there's nothing to show for it the next day: Maoist rebel activity. So when a group of villagers in the state's Kanker district, the gateway to Bastar, were kept awake for nights on end last month by repeated chinking from metal striking rock on a nearby road, they knew something was up.
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My Comment: The Scholar's Stage has an excellent summary on this conflict in India. The link is here.