Reporter thats right, melissa, keeping Nuclear Weapons and materials out of the hands of terrorists is especially hoon at agenda here for the summit of 56 leaders that have come here because of recent isis attacks in paris an brussels. Which have shown isis is capable of launching mass attacks in large urban areas. Last week leaders agreed to add to the last minute, a special meeting here tomorrow on fighting isis including keeping it from obtaining Nuclear Weapons. We are committed to working together on combating isil. At the end of this Nuclear Security summit, there will be International Focus what additional steps need to be taken in light of the terrible tragedy that took place in brussels. Reporter and there are new warnings about isiss efforts to get Nuclear Weapons and materials coming out of belgium where investigators found a videotape of a highranking Belgian Nuclear official that had been taped by isis operatives. Leaders want tighter control on materials for one thing. Th