I might be wrong, but i would have thought the definition of a terrorist attack is one in which there is an ideology or religion as the root cause of it,
rather than something that is terrifying to other people.
I would also think that such terrorist attacks are, in the main, premeditated, and for the life of me i cannot see how this incident could have rationally been planned (unless they'd been watching The Taking Of Pelham 123 beforehand).
There's nowhere to run or escape on a train.
And in addition, if their intentions were to cause as much carnage as possible, why stop at 10 people when there's a whole train full of potential other victims?
I am guessing here, but that's pretty much what everyone else is doing so it'd be nice if people don't go mental at me :)
My guess is that a couple of lads were on there way into that there London tooled up, for whatever their reasons were, possibly to buy drugs to take back to Peterborough to sell or simply as mules.
Maybe they were recognised by another rival gang and all hell broke loose.
Maybe someone rubbed them up the wrong way and it got out of hand.
Clearly they are wrong 'uns and as my grandmother used to say, it'll all come out in the wash.