From MassLive, which is apparently the screen name for The Republican, a Massachusetts newspaper:
The Social Security Administration office on Bond Street in Springfield was evacuated on Tuesday following a report of a suspicious package.
Just before 10:30 a.m., the city fire department was called to investigate after someone opened a suspicious package and an unidentified white powder was discovered.
According to Dennis Leger, aide to Commissioner Bernard J. Calvi, three employees were potentially exposed to the powder. They didn't appear to be injured, he said, but they were being kept from the public until the regional hazmat team conducted an on-site test of the substance. ...
Social Security Administration employees were sent home for the day just before 11 a.m. Minutes later, Department of Homeland Security officials showed up in a marked SUV. ...