There have been some grisly attacks on London buses (my home town) - one of the reasons I avoid them late at night:

https://www.independent.co.uk/news/uk/crime/i-feel-sorry-for...

https://www.cps.gov.uk/london-north/news/two-youths-jailed-b...

https://people.com/what-happened-in-the-july-7-london-bombin...

We have plenty of beheadings in Europe but not on a Flixbus.