There was "a short stand-off" between football fans and police following a football cup tie.
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Officers from six forces were brought in to help police the FA Cup fifth round fixture between Luton Town and Millwall.
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Violence was feared after the previous cup tie between the sides led to a riot in Kenilworth Road in 1985.
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Seven men were arrested for public order offences in connection with Saturday's match.
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Supt Linda Kelly, of Bedfordshire Police, said: "It is a shame a small minority behaved badly after the game but the vast majority of fans enjoyed the occasion despite the result on the field and went away without causing any problems."
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Millwall won the game 3-0.
Football fans should take things easy sometimes when they go to watch football. They act abnormal sometimes
Arresting them and punishing them is the only solution