On Tuesday, London Mayor Boris Johnson enjoyed the sun's rays as he sat with former Olympic Medal winners Tessa Sanderson, Dame Kelly Holmes, and Jayne Torvill at the Athletes Village in east London.
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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.