A United States citizen has been in the Andaman and Nicobar Islands for allegedly entering the restricted tribal reserve area of the North Sentinel island, PTI reported on Wednesday.

The 24-year-old, identified as Mykhailo Viktorovych Polyakov, was arrested by the Crime Investigation Department on Monday after he allegedly entered the restricted area without permission, the news agency quoted unidentified police officers as saying.

Travelling to the North Sentinel island without a permit is prohibited. The Sentinelese tribe, whose population was around 40 in 2011, have been known to resist contact with outsiders.

The police officers said that Polyakov arrived in Port Blair on March 26, PTI reported. He ventured to the North Sentinel island from the Kurmadera beach on Saturday at around 1 am, carrying a coconut and a can of the beverage Coca-Cola as “offerings for the Sentinelese”, they added.

Polyakov reached the northeastern shore of the North Sentinel island by 10 am and remained offshore for an hour, the news agency quoted the police officers as saying. He surveyed and blew his whistle, but saw nobody, they added.

Following this, Polyakov landed on the shore for about five minutes and left the offerings, the police said, adding that he also collected sand samples and recorded a video before...