HILLSBOROUGH, N.C.  — Authorities are investigating after a local Republican Party office in North Carolina was vandalized and set on fire in what a state GOP official called an act of “political terrorism.”

A bottle filled with flammable liquid was thrown through the window of the Orange County Republican Party headquarters overnight, damaging the interior before burning out, according to a Sunday news release from the town of Hillsborough. The office was empty and no one was injured.

Also, someone spray-painted “Nazi Republicans leave town or else” on a nearby wall.

There were no new developments overnight in the investigation, Hillsborough Police Chief Duane Hampton said in an email Monday.