Russian Emergencies Ministry members and firefighters work at the site of a Tatarstan Airlines Boeing 737 crash at Kazan airport, November 17, 2013 in this handout photograph provided by the Russian Emergencies Ministry. REUTERS/Russian Emergencies Ministry/Handout via Reuters
KAZAN, Russia (Reuters) - Russian investigators sifted through the charred remains of a Boeing 737-500 airliner on Monday in the search for clues about what caused it to crash in a nosedive and burst into flames, killing all 50 people on board.
Sunday's crash raised new concerns about Russia's poor safety record as it prepares to host the Winter Olympics in the southern city of Sochi in February, an event on which President Vladimir Putin has staked much personal political prestige.
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