A One Nation truck parked outside a shopping centre in Tasmania has been set on fire.

The truck, driven by One Nation candidate Adam Lambert, was parked near a shopping centre at the time of the attack, while Mr Lambert was inside the store buying groceries.

According to One Nation leader Pauline Hanson, an individual was seen torching the vehicle before fleeing the scene.

Ms Hanson posted a video of the truck ablaze on Facebook saying, “Isn’t it amazing how the left call for tolerance all the time, but act like they’re above the law when you don’t agree with their ideology.”

“This is what the left do to conservative parties,” Ms Hanson added. “Yesterday one of our volunteers was bashed and called a ‘white dog’ because he asked a man to stop wrecking our signs in Cowan.

“I’m concerned about where politics is headed in this country,” she said.

Former One Nation senator Malcolm Roberts tweeted: “Eggs, corkscrews and now arson. The Greens have created such a toxic and hateful environment that their supporters feel licenced to attack their ideological opponents. Democracy is under attack.”