Police with dogs keep watch over FC Koln fans during the Europa League match against Arsenal at the Emirates Stadium, London, Thursday Sept. 14, 2017. Extra police were sent to the stadium to deal with disorder after thousands of Cologne fans turned up ahead of the match. The game was due to kick off at 8.05pm but was been delayed by an hour in the interest of fan safety after huge crowds of Cologne supporters arrived at the ground. (Nick Potts/PA via AP)
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