The other crashes were reported, i read about them, I think in the Guardian. I think they were a bit a small article, but it was there.
Realistically though, if seven people have died in a crash in N London and a few got hurt/died elsewhere, the Uk tends to have the headlines. I'm not saying it's not important, just less close to home, if you know what I mean.
I don't think it was the work of a 'terror network' either!