NORTH ADAMS, Mass. — Police are investigating white powdery substances that were sent via mail to government buildings across the state.

According to media reports, the Franklin County Courthouse in Greenfield was evacuated Tuesday while State Police and a Hazmat team investigated a letter that contained the unknown substance.

Similar envelopes were found in two separate buildings in Boston – one at the office of Attorney General Martha Coakley and the other at the office of Sen.Scott Brown.

No injuries were reported and initial tests showed no threat but authorities have taken the substance for further testing, the Boston Globe reported.

Officials from the Berkshire County District Attorney's Office said Tuesday that there have been no incidents reported in the county.

In Elgin, Ill. 28 people were taken to the hospital Monday after a white powdery substance fell out of an envelope at a courthouse. That letter was sent via the U.S. Postal System and initial tests determined it to be non-toxic, according to reports.