FILE - In this Sept. 22, 2009 file photo, a security officer stands his post outside U.S. Cellular Field as a Chicago police cruiser passes before a baseball game in Chicago. The federal government is escalating security around the country in preparation for the 10th anniversary of the 9/11 terrorist attacks and conducting confidential briefings with state and local law enforcement organizations. But officials say there is no specific indication that a terror plot against the U.S. is under way. (AP Photo/Charles Rex Arbogast, File)

Associated Press
FILE - In this Sept. 22, 2009 file photo, a security officer stands his post outside U.S. Cellular Field as a Chicago police cruiser passes before a baseball game in Chicago. The federal government is escalating security around the country in preparation for the 10th anniversary of the 9/11 terrorist attacks and conducting confidential briefings with state and local law enforcement organizations. But officials say there is no specific indication that a terror plot against the U.S. is under way.  (AP Photo/Charles Rex Arbogast, File)
FILE - In this Sept. 22, 2009 file photo, a security officer stands his post outside U.S. Cellular Field as a Chicago police cruiser passes before a baseball game in Chicago. The federal government is escalating security around the country in preparation for the 10th anniversary of the 9/11 terrorist attacks and conducting confidential briefings with state and local law enforcement organizations. But officials say there is no specific indication that a terror plot against the U.S. is under way. (AP Photo/Charles Rex Arbogast, File)
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