Aviation experts say that Russian air defense fire was likely responsible for the Azerbaijani plane crash the day before that killed 38 people and left all 29 survivors injured. Azerbaijan is observing a nationwide day of mourning on Thursday for the victims of the crash. Azerbaijan Airlines’ Embraer 190 was en route from Azerbaijan’s capital of Baku to the Russian city of Grozny in the North Caucasus on Wednesday when it was diverted for reasons yet unclear and crashed while making an attempt to land in Aktau in Kazakhstan. Cellphone footage circulating online appeared to show the aircraft making a steep descent before smashing into the ground in a fireball.