Story in the world of technology. a global cyber attack creating chaos among hospitals across england as teams of technicians work around the clock to restore computer systems. the large scale hack which has affected tens of thousands of computers worldwide used tools believed to have been stolen from the national security agency is. bryan llenas has more details. bryan, what can you explain to us about situation? >> reporter: well, look, liz, hackers exploited a software flaw is in windows microsoft computers, a flaw that was creditly once a part of the u.s. government's national -- secretly ...