Coptic Christians across Europe are on high alert following last week's attack in Alexandria, Egypt when a suicide bomber detonated explosives outside a church, killing 21 people.
Officers in France are investigating online threats against worshippers, in a country which has the largest Coptic community in western Europe.
Churchgoers across the continent are praying for a peaceful day on Friday, when the Coptic Church celebrates Christmas.
Harry Smith reports from London.
Content on this website is for general information purposes only. Your comments are provided by your own free will and you take sole responsibility for any direct or indirect liability. You hereby provide us with an irrevocable, unlimited, and global license for no consideration to use, reuse, delete or publish comments, in accordance with Community Rules & Guidelines and Terms and Conditions.