This research brief describes work documented in "A National Survey of Stress Reactions After the September 11, 2001, Terrorist Attacks," New England Journal of Medicine, Vol. 345, No. 20, November 15, 2001, pp. 1507-1512.

As survivors of natural disasters, violent crimes, and war attest, people who are victims or witnesses of a traumatic event often experience symptoms of stress, sometimes for years after. But events in recent years have taught us that individuals need not be present at a catastrophic event to experience stress symptoms.

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