attack, for instance, that we saw in london on westminster bridge, the car ramming. and this is going to be a big challenge for them here. >> well, certainly the top of terrorist organizations particularly looking for the large signature attack with high casuals, you know, in the kind of center of a town that we've seen, that this one obviously is the kind of information that the police are obviously going to be trying to track down as quickly as possible is identifying who the person was, going through all the intelligence data, they've been able to collect, sifting through all the data and charting the hours and days leading up to it. because the most important aspect of this is trying to work out what the network that put forward, planned and executed the attack is and whether they've got any other attacks in store. something like this is not a lone wolf attack.