The number of people arrested in connection with the violence before and after Euro 2012's Group A match between Russia and Poland has risen to 184, according to a Polish Police website.
Ten people, including seven Poles, two Russians and a German, had to be treated for non-life threatening injuries. Police are continuing their investigation into the violence.
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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.