Watch: Tensions flare during Hong Kong demonstration at Auckland University

Tensions have flared at a demonstration at Auckland University in support of protests in Hong Kong.

About 100 people turned out for the protest on Tuesday, many wearing black face masks to hide their identity.

Today's event was free of physical conflict, however there was a confrontation when a pro-Beijing man appeared holding a sign saying "Hong Kong independence mob".

As multiple people attempted to film his face on their phones, he was shouted down by a protester and left.

A similar protest at Auckland University last week became physical as students clashed over a controversial proposed extradition Bill that could see people sent to mainland China for trial.

Video shows pro-Chinese government students verbally threatening another group of students before pushing New Zealand protest organiser Serena Lee to the ground.

The China Consulate in Auckland later released a statement praising the "spontaneous patriotism" of the students standing up for China. Lee told Newshub she has received death threats since the demonstration.

The University of Auckland says a formal investigation is underway into last week's demonstration and the students involved have been spoken to.

A police spokesperson told Newshub that police have spoken with the complainant and will be investigating the incident in due course.

However the China Consulate has slammed New Zealand media reports of the incident and the events in Hong Kong as "biased". 

"The Consulate General strongly condemns the use of the recent situation in Hong Kong, under the pretext of so-called academic freedom and freedom of expression, on the university campus to engage in smearing attacks on the Chinese government and the Hong Kong SAR government, inciting anti-China sentiment, and creating opposition between Chinese and Hong Kong students," a translated version of the Chinese text said.

"The Consulate General wishes to reiterate here that Hong Kong is China's Hong Kong and that Hong Kong affairs are China's internal affairs, and no external forces can interfere."