The Kremlin on Thursday warned against speculating what may have caused an Azerbaijan Airlines flight to crash, killing 38 of the 67 on board, after an aviation expert said evidence indicated that a Russian anti-missile battery may have brought down the passenger plane.

An Azerbaijan Airlines flight that crashed in Kazakhstan on Wednesday was downed by a Russian air defence system, four sources in Azerbaijan with knowledge of the investigation told Reuters.

Footage of the wrecked fuselage appeared to indicate shrapnel damage and some aviation experts suggested the Azerbaijani Airlines plane may have been ... "None of these countries - Azerbaijan, Russia or Kazakhstan - is interested in hiding information.

The Azerbaijan Airlines flight was en route from Azerbaijan’s capital Baku to Grozny in Chechnya, southern Russia, when it diverted and crash-landed in Kazakhstan, killing 38 people. Twenty-nine passengers survived.

The Azerbaijan Airlines plane crashed hundreds of miles away from its intended destination in Russia with dozens having being killed in the impact on Christmas Day

An Azerbaijan Airlines flight from the Azerbaijani capital of Baku to Russia crashed, hospitalizing survivors while dozens are feared dead.

Azerbaijan on Thursday observed a nationwide day of mourning for the victims of the plane crash that killed 38 people and left all 29 survivors injured as speculation mounted about a possible cause of the disaster, with some experts saying that the airliner was damaged by Russian air defense fire.

An Azerbaijan Airlines flight that crashed in Kazakhstan was downed by a Russian air defence system, four sources in Azerbaijan with knowledge of the investigation have said.

An Embraer EMBR3.SA passenger jet crashed on Wednesday, while the plane was en route from Baku, Azerbaijan, to Grozny, Russia.

The Azerbaijan Airlines Embraer 190 flight left Baku, Azerbaijan, on Christmas to Grozny, Russia. Instead, the plane crashed in Aktau, Kazakhstan.

An Azerbaijan Airlines plane crash on Christmas Day has prompted speculation the plane was shot down by Russia after it took a detour of hundreds of miles in the wrong direction and crash-landed with holes in the fuselage.