American John Allen Chau was allegedly killed by an isolated tribe from North Sentinel island in the Andaman Sea. The Sentinelese tribe is known for attacking with bows, arrows and spears anyone who comes near them. John was seen interacting with the tribesmen during his first visit. It is a mystery as to what happened during his second visit.The fishermen saw the tribesmen drag Chau's body along the beach and bury his remains.Police have arrested seven fishermen who helped him reach the island.Visits to the island are heavily restricted by the government.