Senator Bernie Sanders’ office in Vermont caught fire. Arson is suspected, but the motive is unclear.

Police in vermont are searching for a suspect who allegedly started a fire outside the office of US Senator Bernie Sanders. The small fire caused minor damage, but no injuries.

Authorities say an unknown male suspect sprayed what they believed to be a possible accelerant on the office door, set it on fire and fled. They said the suspect remained at large and no motive had been established.

“A significant fire engulfed the door and part of the vestibule, impeding the exit of staff members working in the office and endangering their lives,” Burlington police said in a statement. “The sprinkler system then switched on and largely extinguished the fire.”

Earlier in the day, the Burlington Fire Department said it responded to a call Friday morning and found a fire between the vestibule, elevator and entry door of Sanders’ third-floor office in Burlington. The office door suffered minor fire damage and much of the third floor suffered significant water damage. Sanders’ offices and nearby offices were evacuated.

A Sanders spokesperson did not immediately respond to a request for comment. Sanders was out of the office.