New York City Police officer King Tung, right, stands outside the rotunda entrance to Citi Field as fans enter the stadium before a baseball game between the New York Mets and the Chicago Cubs, Friday, Sept. 9, 2011, in New York. The latest threat, potentially targeting New York or Washington, prompted an even greater security surge in those cities. Law enforcement around the country had already increased security measures at airports, nuclear plants, train stations and more in the weeks leading up to the 10th anniversary of the Sept. 11 attacks. (AP Photo/Kathy Kmonicek)