The Tatarstan Airlines flight from Moscow was making a second attempt to land late Sunday and exploded when it hit the runway.
Russian Plane Crash Kills 50

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People place flowers in Kazan airport, Russia, Nov. 18, 2013.

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Officials and investigators search a plane crash site in Kazan airport, Russia, Nov. 18, 2013.

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Fire fighters and rescuers work at the crash site of a Russian passenger airliner near Kazan, Nov. 17, 2013. (Russian Emergency Situations Ministry)

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Fire fighters and rescuers work at the crash site of a Russian passenger airliner near Kazan, Nov. 17, 2013. (Russian Emergency Situations Ministry)