“Among the revelations is that following the Paris attacks, Laachraoui, from Brussels, consulted with an ISIS bombmaker linked to the ISIS external operations division in Syria, to improve on the explosive recipe he had used to build the suicide vests worn by the Paris attackers. In addition, a number of audio recordings were recovered from the computer in which Laachraoui briefed a senior ISIS operative on every aspect of their attack-planning.
Investigators say the terrorist cell communicated with ISIS in Syria via encryption apps, providing an umbilical cord between the terrorist organization and the Paris and Brussels attack teams that allowed ISIS operatives in the vicinity of Raqqa to guide the plotters every step of the way and significantly enhance their capabilities. While the TATP suicide vests used by the stadium attackers in Paris on November 13 produced only small explosions killing one person, the Brussels TATP suitcase bombs were much more powerful and killed 32.”
Source: Explosive revelations – CNN.com