There will be a memorial service for Officer Sean Collier on Wednesday at noon on Briggs Field. It is open to law enforcement and the MIT community. The following streets will be closed: Mass. Ave. between Albany and Beacon St. starting at 7 a.m., Vassar between Audrey and Mass. Ave. at 6 a.m., and Memorial Drive between Mass. Ave. and the BU Bridge at 12 a.m.

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