Two Britons held in Russia over a Greenpeace protest have been ordered to remain in pre-trial detention, a defeat for the first of the many foreigners among the 30 detainees to seek bail.
Freelance videographer Kieron Bryan and Greenpeace activist Phillip Ball, who, like the others, face piracy charges, had appealed against an order that they be held through late November.
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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.