It's still very difficult to get much of an idea of what happened. Must be very hard for the staff in hospitals today - not as if they were having an easy time without this.
I'm trying hard to ignore the romours which are flying like confetti, but the only certain thing is that at least two were stabbed, one critically - mortally - injured, and two died in the collision.
Who they were, I don't know, and there haven't been any reports on reliable media yet.