Ahead of their march against Cardiff City which could see Hull City end their three-year exile from the Premier League if they win, the club has tweeted:
The club need to match Watford's result at home to Leed to ensure second place automatic promotion.
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Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.