A Robinson helicopter has reportedly crashed in Lake Teletskoye in the Altai mountains, a source in the local emergencies services told TASS on Sunday.

"According to preliminary information, the helicopter crashed 40 kilometers southeast of the settlement of Artybash, into a hard-to-reach area in Lake Teletskoye. The accident was reported by an eyewitness," the source said.

There were five people onboard the helicopter.