. >>> let's bring in brian dillon, former operational head of new scotland yard and thomas anderson who the transnational threats project at the center for strategic and international studies. brian, this, as bill was just saying, was an ariana grande concert, an american singer, the majority of her fans are young girls, teenagers, mostly families there, many of the victims we've already seen have been young girls. what do you make of this specific target? >> i think there's a number of aspects to it. i think the first point i would make is that this is classically a very soft target, a music venue where young people are attending, wouldn't necessarily of itself attract a significant threat assessment, is regrettably an easy target to attack. in the center of a city where it would appear the individual who is responsible would be familiar with it and comfortable in his surroundings and then as bill has correctly highlighted, the presence of a very popular american singer, again, adds an element of risk into this scenario. so all of these factors together make this a very worrying and tr