transport well very volatile probably locally made. what do these pieces mean to you? >> reporter: this is a really big concern, this is important for our viewers in the u.s. perhaps they don't understand these kind of weapons, assault weapons, grenades suicide, it's very difficult to get ahold of these weapons in europe. very strict gun control here. how did these men get ahold of these weapons and where did they get ahold of the explosive vest vests? where did the get it in syria or were they working with a criminal enterprise. we know with "charlie hebdo," there were strong criminal link links. and they try to explore this nexus on the one hand criminal elements who know how to dodge police who know how to get weapons, who know how to get explosives and also radicalized element elements who have been so brutalized and dehumanized by