Azerbaijan Airlines’ Embraer 190 was en route from Baku to the Russian city of Grozny when it was diverted for reasons yet unclear and crashed while making an attempt to land in Aktau in Kazakhstan.

Russian aviation authorities said the Azerbaijan Airlines plane had hit a flock of birds. But some experts cast doubt on that account, pointing to footage showing apparent holes in the fuselage.

Industry experts and Ukraine officials are suggesting that Russia likely is to blame for the Azerbaijan plane crash that killed dozens. NBC News' Daniele Hamamdjian reports on the ongoing investigation and what may have caused the crash.