gather just a few days before the thanksgiving from coast to coast at american airports...sporti ng events ...and everyday places where large crowds gather just a few days before the thanksgiving holiday. in europe..the highest terror threat ever?.as officials continue the manhunt for a paris attacker. abc' s stephanie ramos reports from washington. " american cities on edge. in atlanta...police saying they received information about a threat against this pro wrestling event over the weekend. nothing happening here...but americans alert and cautious more than a week after the paris terror attacks... in new york city... nypd officers swarming a subway station...guns drawn....during this planned drill simulating an active shooter situation underground.. sot: william bratton, nypd police commissioner: "these exercises are time, very well prepared." and in europe... for the 3rd day in a row....brussels....the "capital" of a small european nation and also home to half a billion people ...put on the highest terror warning. ......the manhunt - growing for escaped paris killer- salah abdesl