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.

Crash killed 38 people and left all 29 survivors injured as speculation mounted about a possible cause of the disaster.{ai:summary}<p>Azerbaijan held a nationwide day of mourning for the 38 victims of a recent plane crash, with 29 survivors reported injured. Experts are speculating that the airliner may have been damaged by Russian air defense fire, raising concerns about the incident's cause. #foreignaffairs</p>

Some experts allege Russia's air defence behind Azerbaijan Airlines crash. Here's why

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