The mother of a young teenager killed by a drug driver said the impact her daughter's death had on the family was "absolutely massive".
Natasha Groves, who lost her daughter Lilian in June 2010, told Good Morning Britainmost drug drivers "think they are invincible".
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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.