A Metropolitan Police spokesman said the arrests were made over alleged public order offences.
Six males were arrested during the game at Millwall in relation to a banner being unfurled at the game. They remain in custody at this time."
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An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.