the french investigators managed to recover one of their vests intact, and they are examining its makeup. in the meantime, the senior belgian bombmaker who made the vests are still at large. they are so lethal there is a sip ster nickname for them, and they are called the o mother of satan. they are made out of explosives that are really easy to buy. for that we turn to jason carroll. reporter: the first sound of the explosion echoed throughout france s soccer statement. across paris other attackers detonate their suicide vests is after killing scores at this n concert hall. and at this cafe where bra heem abdeslam detonates his vest, and his younger brother salah still at large. it is still unaware what the brothers were planning.