From Governor Baker's office:
Please be advised that in accordance with United States Public law 103-332, Massachusetts Governor Charlie Baker has ordered that the United States flag and the Commonwealth flag be lowered to half-staff at all state buildings from sunrise until sunset on Monday, May 15th, 2017 in honor of National Peace Officers Memorial Day.
This gubernatorial order applies to:
1. The main or administration building of each public institution of the Commonwealth, e.g. town and city halls.
2. Other state-owned or state-controlled buildings.
3. All state military installations.