A "Security Awareness" bulletin issued by the FBI and the Department of Homeland Security (DHS) urges vigilance over the July Fourth weekend, as terror network al Qaeda might be contemplating an attack on the Independence Day.
The annual summer holiday "Security Awareness" Bulletin, a six-page document, says Al Qaeda had identified July Fourth weekend of 2011 as ideal for an attack, back in February 2010. Though "specific or credible information" regarding a terrorist strike isn't available, al Qaeda is believed to be contemplating large scale destruction on symbolic dates.
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Update #1: Summer holiday could tempt terrorists, federal officials warn -- CNN
Update #2: FBI and DHS Urge Vigilance on July 4 -- ABC News
My Comment: I expect these alerts will be with us for a very long time.