Knife Attack in Amsterdam Severely Injures 5

Because that is the state of Europe. KNIFE HORROR Amsterdam knifeman ‘stabs 5 including 2 American tourists’ in rampage as witnesses heard piercing screams in Dam Square

It is exactly what you expect. I've read several accounts in various news sources. A number seem to say that "no motive is known," or so the authorities claim, and they often note that prior attacks have been blamed on mental illness.

Now maybe those were only the early reports, because then there is this:

Terrified witnesses reported hearing the alleged knifeman shout "Allahu Akbar" before lunging at his first victim.

Investigators also discovered an IS flag inside the suspect's apartment, according to state police chief Michaela Kohlweiss.

Maybe Europe will wake up before they lose everything, but I doubt it.