At least 28 people were killed after gunmen attacked vehicles carrying Christian worshippers.
The Egyptian air force carried out six air raids in neighbouring Libya just hours after the attack.
Al Jazeera’s Victoria Gatenby reports.
- Subscribe to our channel: http://aje.io/AJSubscribe
- Follow us on Twitter: https://twitter.com/AJEnglish
- Find us on Facebook: https://www.facebook.com/aljazeera
- Check our website: http://www.aljazeera.com/