Overview
- The device detonated around 2:48 a.m. on the fourth floor of the Goldenson Building on Harvard’s Longwood medical campus.
 - A responding Harvard University police officer saw two masked people running from the building and was unable to stop them.
 - Investigators released surveillance stills of the persons of interest and asked anyone with information to call HUPD’s Detective Bureau at 617-495-1796.
 - Boston Police swept the building and found no additional devices, and no injuries were reported.
 - The multiagency probe, with the FBI assisting, has closed the affected area for forensic work while authorities assess damage and review evidence.