District of Columbia Mayor Vincent Gray, left, Police Chief Cathy Lanier, and James McJunkin, assistant director in charge of the Washington Field Office of the FBI, speak to the media about an unconfirmed terror threat to the city, in Washington, on Thursday, Sept. 8, 2011. Law enforcement officials in say they are working to corroborate a terrorism threat against the city after government officials said they were investigating a detailed al-Qaida car bomb plot aimed at bridges or tunnels in New York or Washington.(AP Photo/Jacquelyn Martin)
Read the article: D.C. Police: Suspicious activity tips up 60 percent
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