State police and emergency services responded to home at 18 Hunters Run in the Oakdale section of Montville after a resident opened an envelope filled with white powder that turned out to be industrial salt Saturday afternoon, according to police.
State police spokesman Lt. Paul Vance said he was notified of the incident, which has been deemed a hazmat situation, around 2 p.m. The scene was clear by 4:30.
Authorities collected a sample of the powder and took it to the state police crime lab for testing. Vance said Saturday night that the substance was identified as industrial salt.
It's not clear if anyone else was inside the home at the time of the incident. Vance said the neighborhood was not evacuated.
Officials from the state Department of Energy and Environmental Protection said the FBI is handling the investigation.
According to FBI Special Agent Dan Cutin, "it is standard protocol to assemble, respond and determine logical investigative steps" any time a powder incident is reported in the state.