FC Cologne fans block roads in London
Thousands of football fans brought traffic to a halt in central London ahead of their team's Europa League match against Arsenal on Thursday.
Some 20,000 FC Cologne supporters have reportedly come to London.
They briefly brought traffic in the West End to a standstill as they marched down Oxford Street.
Only 2,900 tickets have been allocated to the away fans for the match at the Emirates stadium in north London.
Police said there have been no arrests so far.