An electrical fire at the State House Tuesday that forced the evacuation of the building was “accidental,” state police said in a Wednesday afternoon statement.

The fire started from “electrical faults” in two lines that run from an electrical vault near a guard shack to a pull box in the sub-basement of the building, a group of investigators determined. Building management shuttered the State House Tuesday afternoon and kept it closed Wednesday because of concerns about high levels of carbon monoxide.

“There is no information or evidence to suggest the fire was intentionally set,” State Police spokesman Dave Procopio said in a statement.

Firefighters responded to the historic state capitol just after 2 p.m. Tuesday when the electrical fire was discovered in the sub-basement. Lawmakers, staff, and members of the public poured out of the building at the direction of authorities, congregating on nearby streets as firetrucks pulled up to the building.

The fire followed a false alarm earlier in the day. Procopio said Wednesday that two visitors “accidentally” triggered the alarm Tuesday morning “ under the mistaken assumption that it was a mechanism to open a door.”

The first alarm interrupted a meeting of House lawmakers, who were gathered for the second time this week to review major gun reform legislation that has since been caught up in a procedural dispute with the Senate.

“The two incidents were not connected,” Procopio said of both fire alarms.

A House informal session scheduled for Wednesday morning was scrapped and the branch plans to meet next on Thursday morning, a spokesperson for House Speaker Ronald Mariano told the Herald.

A spokesperson for Gov. Maura Healey, who provided updates Tuesday on the building’s status, did not immediately respond to a Wednesday inquiry as to whether the State House would open to the public on Thursday.