This is a variant (new, but not unique as the first report told us) of killing people by having them run over. It is a method openly advocated by ISIS and copied by many of its sympathisers. Examples: Nice, Barcelona, two London bridges.
So why is Europe importing large numbers of people with an ideology whose adherents are so massively over-represented in urban atrocities? It's perverse, like seeking out the electrical goods manufacturers with the worst record for electrical faults rather than finding out who they are and avoiding them. (To borrow from Prudie short for Prudence's point about toasters).
It is worse than perverse. It means that all the wise monkeys with all the right "thinking", but no functioning sensory organs, on this thread who deny any connection between these novel classes of crime and the culture of the perpetrators are willing to sacrifice any number of their own citizens in order to maintain the their multi-cultural credentials and keep their seat at the Hampstead dinner party. Salman Abedi? Fish him out of the Med, bring him here, feed, house, clothe and educate him. Oops, nail bomb and shattered limbs of teenage girls. Shut up, racist! Libyans? Lovely people.