Arsenal's Europa League group game against Bundesliga outfit Köln has been delayed by one hour & will now kick-off at 21:05 BST.
A confirmation by the Gunners on its Twitter account reads: "The kick-off of #AFCvCOL has been delayed by an hour in the interests of crowd safety."
20,000 FC Koln fans reportedly descended upon London as West End was brought to standstill
ahead of the Europa League showdown earlier on Thursday.
It is the first time in 25 years Cologne has played in an international club competition. Police according to BBC Sports said flares were let off but reported no 'significant disorder'.
The Bundesliga estimated around 20,000 fans had traveled to the capital to support their team. It added only 2,900 tickets had been allocated to the away fans for tonight's match at the Emirates Stadium in north London.
In a statement, the Met Police said: "At around 15:00 BST on Thursday, 14 September a large group of football fans gathered in Oxford Street.
"The group was at the location for about 30 minutes whilst they boarded public transport to travel to a football match this evening.
"They did throw bottles and let off flares, but there was no significant disorder, police were on scene and there have been no arrests. The group has now left the area."