You have two groups of people. You have everyone who was scheduled to go out today and everyone who was scheduled to go out yesterday, trying to rebook today.
I walked around last night and there wasn't 20 people here.
It was not a bomb threat, he did not have a weapon, he did not say he had a weapon, he did not say he was going to blow up a plane or anything. But the nature of the wording was enough for them to decide to take the action they did.