Prime Minister David Cameron has said that the people of the United Kingdom "must say to Scotland: we want you to stay."
In a tweet, Mr Cameron said:
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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."