Technicians were called to the courthouse at about 1:15 p.m., though the Boston Fire Department said there was no confirmed hazmat incident.
Firefighters have called in Massachusetts State Police after finding multiple propane tanks likely filled with ammonia in different locations.
The Independence Mall in Kingston was evacuated Tuesday due to a hazmat incident.
Several buildings were evacuated on Huntington Ave. and Longwood Ave. on Monday morning.
Four firefighters were transported to the hospital after responding to a hazmat situation on Ballard Road in Lawrence early Sunday morning.
One person has died and 11 others were rushed to a hospital after an incident involving hazardous materials inside a Plymouth school.
Police are investigating three different incidents involving greeting cards with an unidentified white powder inside mailed to businesses in the Greater Lawrence area.
Hazmat crews were on scene at a house in Brighton Saturday morning.
A gas leak forced an evacuation at a lab on the campus of MIT on Thursday.
A hazardous materials team responded to a brief incident at a state prison in Gardner.