WOW!!!!!, I was there today and did not hear a thing about this. They did not evacuate the concourses or anything. Scary.
They only evacuated the South Terminal, Delta's bagroom downstairs, and the southern part of the Atrium. Most people did not even know about it. I was in and out @ ATL
all day and was trying to drop off an order to a shop in the Atrium a little bit after 12 pm, and the elevator I used to go upstairs opens up in the area they evacuated, and I really did not know what was going on, and a cop said I needed to get behind the rope they were using to block off the area (You'd think they would have shutdown that particular elevator since it was in the evacuation area.). I had gone right past the security guard downstairs with a cart loaded with some totes, and she didn't even say anything about what was going on upstairs until after I asked her after coming back downstairs.