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Spate of armed robberies leaves many at BU on edge

Boston University and local ­police departments announced plans Wednesday to step up patrols after a BU research assistant was stabbed and robbed the night ­before in the latest and most violent in a series of eight alarming street attacks near the campus this academic year.

Robert A. Brown, the university’s president, said patrols had been significantly bolstered after robberies in the fall and earlier this winter. Suspects were arrested ­after some of those incidents.

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