The MIT and law enforcement communities will gather tomorrow at noon on MIT’s Briggs Field to mourn the loss of Officer Sean Collier, a dedicated peace officer who lost his life in the line of duty early last Friday. MIT classes will be cancelled, and several major thoroughfares will be closed to accommodate Officer Collier’s memorial service. Public safety officials have asked anyone planning to use the following roads and bridges to seek alternate routes:

• Vassar St.: closed between Audrey St.  and Mass. Ave. beginning at 6am
• Massachusetts Ave.: closed between Albany St. and the Charles River beginning at 7am
• Memorial Dr.: closed between Mass. Ave. and the B.U. Bridge beginning at 12 noon
• Mass. Ave. Bridge: closed to Cambridge-bound traffic beginning at 7am

The Cambridge Police Department expects traffic to return to normal around 6pm, but they’re asking residents and commuters to check their website or follow them on Twitter (@CambridgePolice).

The memorial is closed to the general public: only law enforcement personnel and members of the MIT community with MIT IDs may attend. The loss of Officer Collier affects not only MIT and Cambridge but also our neighbors in Somerville, where Officer Collier was on track to join the Somerville Police Department. I would ask that you keep Officer Collier’s family in your thoughts and prayers, and to plan your day with the traffic changes in mind.