British heptathlete Jessica Ennis has set a new heptathlon world record in the women's 100m hurdles - the first event in the heptathlon. She ran a time of 12.54 seconds.
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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.