The Russian government has cautioned against promoting “hypotheses” about the cause of the crash of a Russia-bound passenger plane that killed 38 people in Kazakhstan on Wednesday.
The aviation and Ukrainian officials are placing the blame for the deadly crash on Russia, reports say.
Footage of the wrecked fuselage appeared to indicate shrapnel damage and some aviation experts suggested the Azerbaijani Airlines plane may have been been hit by air defence systems over the Russian republic of Chechnya.
Before it went down near the Kazakh city of Aktau, the plane was diverted across the Caspian Sea, from its destination in Chechnya to western Kazakhstan.
Twenty nine of the 67 people on board survived. Azerbaijan held a national day of mourning on Thursday for the victims of the crash.