![Cologne Cathedral is under tightened police protection after German police were warned of a potential threat. EPA](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/IJSDGSTUGFGJ5DAFRI6OADD2ZI?smart=true&auth=be35c0e25d7daf568d508b2ff8c64910c72c3739217c24252f62b8165c081eb2&width=400&height=225)
Cologne Cathedral is under tightened police protection after German police were warned of a potential threat. EPA
Cologne Cathedral is under tightened police protection after German police were warned of a potential threat. EPA
Security increased across Europe over Christmas terror attack fears
Worshippers face searched at Cologne Cathedral following an alert