The graffiti - which included a swastika and the words "Nazi Republicans leave town or else" - was spray-painted in black on the side of an adjacent building, Balloons Above Orange, 353 Ja-Max Drive. They said no one was in the party office at the time, but the substance burned furniture and charred campaign signs.
"They threw some sort of firebomb through the window because it smoked up under the porch and all around the window frame", the caller said.
Democratic nominee Hillary Clinton has condemned the incident calling it horrific and unacceptable.
State and national leaders have responded to the event including presidential candidates Donald Trump and Hillary Clinton. Former Howard Dean campaign advisor David Weinberger launched a GoFundMe page with a $10,000 goal to help fix the damage and re-open the office "as soon as possible".
"Everyone. Republicans, Democrats or independents, universally condemn this attack", he said.
The attack badly damaged the inside of the Orange County office.
Police said they were sifting through evidence and trying to narrow the timeframe of when the incident occurred. Pat McCrory, Hillsborough Mayor Tom Stevens, first responders and law enforcement at every level who are "working diligently to hold to strict account those who engaged in this attack on the American political system".
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Roy Laughlin, a resident of Maysville, North Carolina, who visited the Hillsborough office said this attack will backfire against those who wished to do the Republican party harm.
Wickersham says he's committed to keeping the Pamlico GOP office open to the public and says additional security measures will be taken.
Republican vice presidential candidate, Indiana Gov. Mike Pence, right, enters the Orange County Republican Party Headquarters with Matthew Arnold, N.C. fourth congressional district chair, left, Tuesday, Oct.
Weeks confirmed that GOP staff were back at work - despite the office being inoperable.
The 911 call about damage to the GOP's Orange County office in Hillsborough was released Monday with some parts redacted and the caller's voice deliberately distorted to protect the person's identity, Hillsborough police said.
"We're not going to be intimated; we're not going to be cowed", Woodhouse said. "Very grateful that everyone is safe", her tweet states. McCrory said he's never seen political behavior such as this before.
"This is political terrorism", said Dallas Woodhouse, executive director of the North Carolina Republican Party.