Harry Potter & J.K. Rowling - National security risk?

J.K. Rowling aparently had a bit of a battle with airport security on her recent visit to New York. The security agents attempted to stop her from carrying on her partially handwritten manuscript to the anxiously awaited book 7 of her famous Harry Potter series. She was eventually allowed to bring the manuscript on the plane, bound up in rubber bands.

What did they think she was going to do? Threaten to give everyone paper cuts?