Azerbaijan held a day of mourning on Thursday for the dozens of victims of an airliner crash in Kazakhstan, as questions were being asked over the cause of the disaster.

An Azerbaijan Airlines Embraer 190 was en route from Azerbaijan's capital of Baku to the Russian city of Grozny when it crashed, killing 38 people onboard.

The flight was en route from the Azerbaijani capital of Baku to Grozny, in Russia’s south, when it diverted and attempted an emergency landing in Kazakhstan.