Officials believe they survived the devastation by using age-old early warning systems.
They might have run to high ground for safety...
the story's point
An Indian helicopter dropping food and water over the remote Andaman and Nicobar Islands has been attacked by tribesmen using bows and arrows.
There were fears that the endangered tribal groups had been wiped out when massive waves struck their islands.
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But the authorities say the attack is a sign that they have survived.
BBC