of experts to explore this further. in london, a geopolitical analyst and author. he serves as the cofounder of economic partners. and in beirut today but actually based in london at the school of economics. an expert on terrorism and the co-author of "isis: the state of terr terror." and peter bergen joins us from washington. he is a vice president at new america. peter, let me ask you, does this strike you as terrorists adapting yet again? because what is interesting about this to me is it's in many ways very low tech. a van going into crowds, people brandishing knives and using them as weapons. of course, guns are very hard to get in britain. maybe i'm just trying to look for a silver lining here. all of that means they're