Asked about the jailing of former Cabinet colleague Chris Huhne, Prime Minister David Cameron said: "It's a reminder that no-one, however high and mighty, is out of the reach of the justice system."
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163,000 French and 143,000 German soldiers were killed in the 10-month battle in 1916.
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The fire broke out on Sunday morning at the home for 35 residents in Litochki, a village 25 miles north of Kiev.