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During Exam, Man Threatens to Blow Up Science Center

Beck said Leong, who identified himself to police as a homeless person from Cambridge, was originally from Tierrasanta, Calif.

--Staff writers Marc J. Ambinder, Edward B. Colby, David H. Gellis, David S. Stolzar and Joseph P. Flood contributed to the reporting of this story.

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--Staff writer Garrett M Graff can be reached at ggraff@fas.harvard.edu. Staff writer Adam M. Lalley can be reached at lalley@fas.harvard.edu.

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