Multiple injured in pepper spray attack at London airport

It was absolutely terrifying. I asked an officer, "What's going on?" And he said, "There's been an attack." I observed three young men, all dressed in black, um, with their heads covered, obscured. Um, and they they seemed a little, uh, sketchy.I I don't know how else to describe it. And then they bolted and they went through a side door and up some uh some stairs. And at that point, uh, people started coughing uh, one at a time at first.And then suddenly I sort of looked around and everyone in the room was ...