The Vermont office of Independent Senator Bernie Sanders was engulfed in flames on Friday, leading authorities to believe that the incident was a deliberate act of arson. The Burlington Fire Department quickly arrived at the scene to extinguish the fire, and an investigation is currently underway. The fire originated at the entrance of the building, where Sanders’ sole state congressional office is located. Surveillance cameras captured footage of a man spraying a flammable substance on the door, as reported by CNN.

“He then lit the accelerant and fled,” the release said, CNN reported. “A significant fire engulfed the door and part of the vestibule, impeding the egress of staff members who were working in the office and endangering their lives.”

NBC News reported that despite the damage and risk, there were no injuries reported, and the senator emerged unscathed. The identity and motive of the suspect are still unknown as the investigation progresses with no arrests made to date.

“We are grateful to the Burlington Fire and Police Departments who responded immediately today to a fire incident that took place in our office building,” said Sanders’ state director Kathryn Van Haste in a statement, according to NBC News. “We are relieved that no one on our staff and, to our understanding, no one in the building was harmed.”