US Secretary if State Hillary Clinton has been discharged from a New York Hospital, the State Department said.
Her medical team found she was making good progress and remain confident she will make a full recovery, officials added.
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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.