Russian investigators comb through plane crash debris

Russian investigators are combing through the charred fragments of a Boeing 737 jetliner as they try to determine what caused it to crash, killing all 50 people on board.

The plane, belonging to the Tatarstan Airlines, crashed yesterday while trying to land at its home port in the Russian city of Kazan, the capital of the oil-rich province of Tatarstan. The son of the provincial governor was among the victims.