Barclays shares rose slightly to 302.85 pence shortly after market open today, after the bank announced its annual results for 2012 and plans to revamp its business.
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."