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Published online 24 April 2007 | Nature | doi:10.1038/news070423-4
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NASA reviewing security procedures after shooting
Gunman carried revolver onto research campus.
Workers at NASA's Johnson Space Center in Houston, Texas, were back on the job Monday after a disgruntled contractor shot himself and one bystander.
William Arthur Phillips, aged 60, entered Building 44 on the centre's sprawling campus on 20 April with a .
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