According to preliminary information, the Mi-8 helicopter was carrying up to 19 people -- five crew and 14 passengers -- when it crashed in a remote area in the northwestern Murmansk region yesterday, a regional police spokeswoman said.
"Yes, indeed the helicopter is in a lake," the spokeswoman told AFP.
Two people were injured and hospitalised and the rest are considered missing, she added, noting that emergencies officials were looking for survivors.
The helicopter belongs to a company called Apatit (Apatite), maker of components for fertilisers, a spokeswoman for the regional emergencies ministry, Tatyana Zakharova, told AFP.
Investigators named a possible aircraft malfunction and bad weather as likely causes of the crash.
Aviation crashes are frequent in Russia and are often blamed on ageing aircraft and poor maintenance.