Arsenal’s Europa League game against Cologne at Emirates Stadium was delayed by an hour “in the interests of crowd safety”, and kicked off at 21:05 BST.
Thousands of ticketless away supporters turned up outside the ground and there were some scuffles between fans and stewards inside after the gates opened.
Police said four people had been arrested on suspicion of public order offences.
The German side had only been given a ticket allocation of 2,900.
But around 20,000 of their fans brought central London to a standstill earlier in the afternoon.
At that stage, police said flares were let off but reported “no significant disorder”.
However, BBC Radio 5 live correspondent Richard Conway later reported witnessing disturbances in the stadium.
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