![German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne](https://www.thesun.co.uk/wp-content/uploads/2017/09/nintchdbpict000353222232.jpg)
German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne
![German police on red alert for more crowd trouble involving Cologne fans amid fears over Serbian ultras' leader - Mirror Online German police on red alert for more crowd trouble involving Cologne fans amid fears over Serbian ultras' leader - Mirror Online](https://i2-prod.mirror.co.uk/incoming/article11175064.ece/ALTERNATES/s1200b/Arsenal-v-FC-Koln-UEFA-Europa-League-Group-H-Emirates-Stadium.jpg)
German police on red alert for more crowd trouble involving Cologne fans amid fears over Serbian ultras' leader - Mirror Online
![German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne](https://www.thesun.co.uk/wp-content/uploads/2017/09/nintchdbpict0003532226191-e1506502228249.jpg)
German police ready to battle Red Star Belgrade hooligans as they descend on Germany for Europa League clash with Cologne
![Pics: Fans badly beaten and stripped in bloody violence during chaotic Belgrade derby - Independent.ie Pics: Fans badly beaten and stripped in bloody violence during chaotic Belgrade derby - Independent.ie](https://www.independent.ie/incoming/fba0d/36407826.ece/AUTOCROP/w620/AFP_V525H.jpg)