Manchester United's official Twitter account has tweeted a picture of temporary boss Ryan Giggs with his coaching staff which includes former players Phil Neville, Nicky Butt and Paul Scholes.
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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."