Iranian Civil Aviation Organization offers no immediate explanation for disaster; Ukrainian officials have backed off claim it was brought down by mechanical trouble

But expert questions how Iran claimed so quickly after the accident that no foul play was involved; US-Iran tensions likely to hamper probe

Canada's FM says he's in touch with Ukraine's government after passenger jet went down near Tehran, killing 176 in total

Amid speculation that accident was linked to missile barrage, Tehran officials insist engine trouble was the cause, but Boeing says 737 was in good condition with experienced crew

Boeing 737 leaves Tehran's international airport for Kyiv, crashes shortly after takeoff, killing everyone on board

Aircraft collides with fence and two-story structure shortly after takeoff from Almaty airport

State media says MiG-29 aircraft found in northwest of country after going down during test flight

Air Force says Su-57 aircraft came down for unknown reason during training flight in country's far east

IDF's visual intelligence unit formed a team of experts that interpreted aerial images of the Pacific and pinpointed the area where the C-130 Hercules vanished with 38 on board

Bodies of Jonathan, Hannah and Saskia Goldstein found amid debris of aircraft that crashed in the Swiss alps