Vandal scrawled 'Nazi Republicans leave town or else' along with

A Republican party headquarters in North Carolina was firebombed and an adjacent building was vandalized with the words: 'Nazi Republicans leave town or else.'

One state GOP official called the attack in Hillsborough, Orange County an act of 'political terrorism', the Charlotte Observer reported.

A bottle, filled with flammable substance, was thrown into a window during the night, setting off a fire that scorched the interior of the building before the blaze burned itself out, police said.

Photos from the interior showed damaged yard signs bearing the names of Donald Trump and Mike Pence, along with other politicians.

With three weeks left until election day, Mayor Tom Stevens acknowledged the significance of the attack, saying: ' This highly disturbing act goes far beyond vandalizing property.

'It willfully threatens our community’s safety, and its hateful message undermines decency, respect and integrity in civic participation.'

A Republican party headquarters in Hillsborough, North Carolina was firebombed and vandalized with the words: 'Nazi Republicans leave town or else' (pictured)

A bottle, filled with flammable substance, was thrown into a window, setting off a fire that scorched the interior of the building before the blaze burned itself out

Mayor Tom Stevens said: ' This highly disturbing act goes far beyond vandalizing property...its hateful message undermines decency, respect and integrity in civic participation'

The GOP headquarters is located in the strip mall Shops at Daniel Boone, with the graffiti left outside Balloons Above Orange a few doors down.

The owner of the balloon shop, Bennie Sparrow, was on her way to church this morning when she saw the 'hateful' message scrawled along the side of her business.

While she has 'no idea' who could be behind the attack, she believes her shop was targeted because it is a 'good billboard to aim towards the Republicans'.

She told the Dailymail.com: 'I'm not afraid to go into work tomorrow but I don't feel quite as secure as I did before. This is the world we live in.'

Police have not been able to estimate the total value of the damages, but executive director of the state's GOP, Dallas Woodhouse, said the office was 'a total loss'.

Woodhouse later issued a statement that said: 'Whether you are Republican, Democrat or Independent, all Americans should be outraged by this hate-filled and violent attack against our democracy.

'Whether the bomb was meant to kill, destroy property or intimidate voters, everyone in this country should be free to express their political viewpoints without fear for their own safety.

'We will be requesting additional security at all Republican Party offices and events between now and Election Day to ensure the safety of our activists, volunteers, and supporters.'

The state's Democratic Party Chair Patsy Keever said: ' I’m appalled that this would happen, certainly we don’t need violence for any reason.

'Clearly this is outrageous that anybody would do this kind of destruction to either party’s buildings or people.'

North Carolina is considered a swing state with polls leaning towards Democratic candidate Hillary Clinton. Orange County, which includes the University of North Carolina in Chapel Hill, is overwhelmingly left-leaning.

A police investigation with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives is ongoing.

The graffiti was left on an adjacent buildingcordoned off with caution tape

An American flag was charred in the fire, which one GOP official called 'political terrorism'