An emergency beacon was activated on a Robinson helicopter as it went missing in the Republic of Sakha (Yakutia) in Russia's Far East on Friday, followed by immediate search and rescue, Paralel.Az reports.

According to the TASS news agency, at approximately 00:40 local time Friday (1540 GMT Thursday) in Yakutia, the Aviation Space Search and Rescue Center detected the beacon from the Robinson R44 II helicopter, which was carrying a pilot and three passengers.

The Yakutsk Transport Prosecutor's Office has launched an investigation, TASS reported.

Currently, aircraft from the regional airline Polar Airlines are prepared for search and rescue.