CNN —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. Officials from Azerbaijan, Kazakhstan and Russia, three countries linked to the disaster, urged people not to speculate about the crash until investigations have concluded. Russian state media reported that the plane was rerouted due to heavy fog in Grozny. Azerbaijan Airlines initially told AZERTAC that the incident was caused by the aircraft colliding with a flock of birds, the outlet reported. Kremlin spokesman Dmitry Peskov said on Thursday that it would be wrong to speculate about the cause of the plane crash before an investigation had been carried out, according to Russian state media RIA Novosti.

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Persons: Kanat Bozumbayev, AZERTAC, Issa Tazhenbayev, Federal Air Transport Agency Rosaviatsia, Andriy Kovalenko, ” Kovalenko, Dmitry Peskov, Maulen Ashimbayev, ”, Ashimbayev, Kanat, “, ” Bozumbayev Organizations: CNN, Azerbaijan Airlines, country’s Ministry, Getty, Federal Air Transport Agency, Ukraine’s Center, National Security and Defense, of, Kremlin, Novosti Locations: Azerbaijan, Kazakhstan, Russia, Baku, Grozny, Russian, Chechnya, Aktau, AFP, of Ukraine, Ukrainian