Cologne have criticised security at Arsenal after both clubs were charged by Uefa following Thursday’s Europa League game.
The German club face four charges, including crowd disturbances and setting off fireworks, while Arsenal face a charge over blocked stairways.
The game was delayed by an hour as thousands of Cologne fans arrived at Emirates Stadium without tickets.
Cologne said “the security concept and communication seemed inadequate and the police force too small”.
About 20,000 Cologne fans arrived in London for the first match in the group stage despite a ticket allocation of only 2,900.
This case will be dealt with by the Uefa’s control, ethics and disciplinary body on 21 September.
More to follow.