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DAVID MUIR (ABC NEWS) (Off-camera) Pierre Thomas, live in Washington. Pierre, thank you. And as you know, Pierre, we are learning more about the gunman tonight. His motive still unclear. Authorities do know he used an AR-style rifle that was owned by his father. Here's our senior investigative correspondent, Aaron Katersky, also in Pennsylvania tonight. [ABSTRACT FROM PUBLISHER]

PAULA FARIS (ABC NEWS) (Voiceover) New fears have been heightened in the wake of the terror attack in Berlin. Law enforcement saying that there is no specific threat but they're not taking any chances and ABC's Linzie Janis is right here in Times Square this morning all the way on top of that iconic building where the ball will drop. I think we can see you, Linzie. Good morning to you. [ABSTRACT FROM PUBLISHER]

AMY ROBACH (ABC NEWS) (Off-camera) Cannot wait for that. But we begin this morning with that terror threat this holiday weekend. Law enforcement all across America on high alert, they're worried about possible attacks, especially from so-called lone wolves inspired by ISIS. ABC's Martha Raddatz is in Washington with the latest on this. Good morning, Martha. [ABSTRACT FROM PUBLISHER]

DAVID MUIR (ABC NEWS) (Off-camera) We want to bring in our chief investigative correspondent, ABC's Brian Ross tonight, working this all day. And Brian, what more do we know about the man behind this? [ABSTRACT FROM PUBLISHER]