At least five people were killed on Wednesday when a Russian security services helicopter crashed in the Chechnya region, the second air disaster to hit Russia in 24 hours.
RIA news agency reported had initially reported there were seven dead, but later said at least five were killed.
Russian news agencies said there were a total of nine people on board.
On Tuesday, an An-26 Russian transport plane crashed on landing at the Hmeimim airbase in Syria , the defense ministry said, killing all 39 people on board in one of the deadliest incidents since Moscow's intervention in the country's war.
The ministry said the 33 passengers and six crew members of the twin-engine plane were all military personnel, in a statement carried by news agencies, revising up an earlier toll of 32.
"The reason for the crash according to preliminary information could have been a technical fault," the ministry said, adding that the plane had not come under fire according to a report from the ground.
The Russian Defense Ministry said a general was among those killed, and Russian media identified him as Maj. Gen. Vladimir Yeremeyev.
It was the second Russian military plane to crash in Syria this year, after a Su-25 ground attack jet was struck by a portable air defense missile over the northern Idlib province last month.
