A video of a lively but peaceful protest and exchange among anti- and pro-Trump supporters turned nasty when a young woman’s hair was set on fire. A video of the incident, which occurred Friday, emerged over the weekend.

Luckily friends were on hand to put out the flames, but there have been calls to find the fire starter.

The video begins with a scene of anti- and pro-Trump supporters facing each other, before the anti-Trump supporters break out in a chorus of chants: “This is what Democracy looks like,” “Love Trumps hate,” and “No justice, No Peace.”

The assault takes place at the 1:14 mark on the video when a Trump loyalist in a blue hat poses for a selfie next to an anti-Trump protester’s sign. When she walks away, her hair is on fire but is quickly put out by a male Trump supporter in the crowd.

It takes a moment for people to realize what has happened, with the girl’s friend telling the crowd: “That’s so f***** up!”

“Did someone really try to set my friend on fire?”

The video zooms in and slows down for the moment when a hand with a lighter is shown extending through the crowd to torch the girl’s hair.

The culprit appears to be a female wearing a blue hat.

Then viewers are returned back to the scene where anti-Trump protesters are apologizing to the female Trump supporter, saying:

“That’s f****** horrible! No one deserves that.”

The edited video includes comments from posters throughout and begins with the opening statement: "This happened on Inauguration Day in Washington DC just after Donald Trump was sworn into office. Everything had been fine up until this moment, and it just comes to show that 'Peaceful' Protests aren't always what they seem to be."

Under the comment section, Becky O’Neil, who says she is the mother of the girl whose hair was set alight, said: “She is physically fine but still shaken.”

Other commentators said they have reached out the DC Metropolitan Police to complain about the incident.

The incident happened just three days after an anti-Trump supporter set himself on fire outside Donald Trump’s International Hotel, according to the Washington Post. Staff at the hotel called the police. The man suffered non-life-threatening burns and was taken to hospital.

Protester tries to set himself on fire outside #Trump hotel in Washington, DC https://t.co/aWqt6jeAjnpic.twitter.com/Wlo8wvsbkc — RT America (@RT_America) January 18, 2017

The 45-year-old man said he was protesting Trump, whom he said was “incapable of respecting the Constitution.”

Witnesses described how he yelled “Trump” several times as “flames ran up his back” before lying down in the street.

DC police told reporters he was not arrested.