Investigators make major discovery over Azerbaijan Airlines plane crash which killed 38 / Putin apologises for 'tragic' Azerbaijan Airlines plane crash but does not take responsibility / Crashed Azerbaijan Airlines plane was damaged over Russia 'due to shooting from the ground', says president / 'Russian air defence system' downed Azerbaijan Airlines plane in deadly crash - Reuters / Azerbaijan Airlines cites 'external physical and technical interference' in early findings of jet Kazakhstan jet crash / Azerbaijan Airlines flight downed over Russia 'almost certainly' hit by missile / Azerbaijan Airlines plane crashes in Kazakhstan, 38 dead, 29 injured / Azerbaijan Airlines plane tried to land twice at Aktau airport before crash / Azerbaijan Airlines plane 'shot down by Russian air defences' killing 38, say government sources / Emergency services arrive at Azerbaijan Airlines plane crash wreckage site