Humphrey Nightingale - whose son Danny was jailed for illegally possessing a gun - has told Daybreak that "whole situation is a farce", but that he is hopeful his son will be released.
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The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.
Thousands of people have donated to help the families of the victims - as well as a homeless man who came to their aid.
Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.