Italian fire brigade divers have released an underwater video of the wreck of a boat which sank off the coast of Lampedusa on Thursday.
The death toll is expected to rise, with hundreds still missing. The head of the Italian coastguard says rescue workers will continue search operations for as long as is needed
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Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.
Investigators believe Mr Kushner has significant information relevant to their inquiry, officials told NBC News.
The men were detained as part of an investigation by MI5 and the Metropolitan Police's Counter Terrorism Command.