The Monroe County Coroner confirmed the third death around 9:45 Monday night.
The shooting broke out shortly after 7:30 p.m. ET at the Ross Township building in Saylorsburg, about 75 miles north of Philadelphia, Monroe County Emergency Management Director Guy Miller told CNN. A suspected gunman was in custody, and the wounded were being taken to various hospitals nearby, he said.
Ross Township's three-member Board of Supervisors meets the first Monday night of the month at the township's municipal building. Monroe County Commissioner Suzanne McCool said it was "the quietest township in Monroe County."
"They are never in the newspaper," McCool said. She said she knew of no controversial issues before the supervisors.
"They are the only township in Monroe County that hasn't had a tax increase in many, many years," she said.
A press conference will be held soon.