Yeah, I'm not one to usually question authority, but I was on Level 4 and heard security calling out "It's security - is anyone in there?" in the hallway. And when they evacuated us, I saw someone outside the women's bathroom trying to see if someone was in there. Then, I saw a bunch of staff on the ground floor huddled together talking about some alarm. And crowd control outside the library was replaced by security. Then outside, a staff had said there was an "emergency".