Tourist helicopter carrying 22 goes missing in Russia's Kamchatka
"Today at about 1615 (0415 GMT) communication was lost with a Mi-8 helicopter ... which had 22 people on board, 19 passengers and three crew members," Kamchatka Governor Vladimir Solodov said in a video posted on Telegram.
Rescue teams in helicopters have been searching into the night for the missing aircraft, focusing on a river valley that the helicopter was due to fly along, Russian authorities said.
The Mi-8 is a Soviet-designed military helicopter that is widely used for transport in Russia.
The missing helicopter had picked up passengers near the Vachkazhets ancient volcano in a scenic area of the peninsula known for its wild landscapes, pristine rivers, geysers and active volcanoes.
Kamchatka, which is nine hours ahead of Moscow, is a popular tourist destination.
A source in the emergency services told TASS news agency that the helicopter disappeared from radar almost immediately after taking off and the crew did not report any problems.
The local weather service said there was poor visibility in the airport area.
Accidents involving planes and helicopters are frequent in Russia's far eastern region, which is sparsely populated and where there is often harsh weather.
The emergencies ministry said the search and rescue operation was being hampered by thick fog in the area.
In August 2021, a Mi-8 helicopter with 16 people on board, including 13 tourists, crashed into a lake in Kamchatka due to poor visibility, killing eight.
In July the same year, a plane crashed as it tried to land on the peninsula, with 22 passengers and 6 crew aboard, all of whom were killed.