The family of the Duchess of Cambridge went to the National Portrait Gallery in central London, to view her portrait of her by Paul Emsley.
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The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.
Jordi Sanchez of the Catalan National Assembly and Jordi Cuixart of the Omnium Cultural group were jailed on Monday.
Storm Ophelia continues to bring strong winds to western parts.