The arrest of a protester turned a peaceful student protest against voluntary student union membership at Auckland University violent.
Students scuffled with police after one of them was arrested as they ended their sit-in protest at an Auckland University building.
About 300 students protesting against a bill making student union membership voluntary occupied the top floor of the Owen Glenn building, the home of the university's business school, for about four hours on Monday afternoon.
After police arrived in numbers, the group started to leave the building peacefully until one person was arrested, Auckland University Students Association president Joe McCrory said.
An altercation broke out with a lot of "pushing and jostling" between the students and police, he told NZN.
Between 150 and 200 people then marched down the street and protested outside the police station.
The students had dispersed by about 8pm, Mr McCrory said.
The students fear the voluntary membership will undermine independent representation on campus and put important student services at risk.
The group was also protesting student fee increases, and supporting staff in a dispute over pay and conditions, he said.
The protest started about 1pm with between 400 and 500 students in the University quad.
The union membership bill, a members bill introduced by Heather Roy of ACT, is due to have its third and final reading on Wednesday and is set to pass with National support.
Students also protested in Waikato and Otago Universities on Monday.
NZ Union of Student Associations co-president David Do said more protests, some with a rugby theme, would be staged in Wellington ahead of the vote in parliament.
NZN