On Alert

doi:10.1126/science.293.5538.2185d

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ScienceScope

At the Department of Energy's national laboratories, security was stepped up. The Livermore National Laboratory in California, for instance, closed public areas, moved security checkpoints to outer fences, and began searching all delivery vehicles. Nonessential staff were asked to stay home on the day of the attacks. Researchers with the lab's National Atmospheric Advisory Release Center were put on alert, ready if needed to monitor and forecast the movement of the smoke plumes created by the fires at the World Trade Center and the Pentagon.