Indian police have arrested a 24-year-old American Youtuber who visited an off-limits island in the Indian ocean to try to make contact with an isolated tribe known for attacking intruders.

Mykhailo Viktorovych Polyakov, from Scottsdale, Arizona, was arrested on March 31, two days after he set foot on the restricted territory of North Sentinel Island — part of India’s Andaman and Nicobar Islands — in a bid to meet people from the reclusive Sentinelese tribe, police said.