"I've seen Trump flags on the forecourt, I've seen Canadian flags on the forecourt," she said, referring to images of former U.S. President Donald Trump carried by some demonstrators as well as the situation in Canada.
Ardern said it appeared the protesters were not interested in a dialogue.
"When you see signs calling for the execution of politicians that's not really a group that wants to engage in political dialogue," Ardern said.
The protests started as a stand against vaccine mandates but now have been joined by groups calling for an end to COVID-19 restrictions, rejecting vaccinations, as well as calling attention to other social issues like censorship and rights of the ethnic Maori community. At the protests' peak, thousands of demonstrators were estimated to be involved.