In a statement, police said they were aware of the possibility of planned protest activity across the Wellington area tomorrow.
Additional staff have been called in from outside of the Wellington Police District and plans are in place to respond if required.
"Police have a low tolerance of any activity that could lead to disruption of Parliament, critical roads or residents.
"While police will respect the right to lawful protest, any behaviour deemed unlawful or that disrupts people from going about their lawful business will not be tolerated."
After the arrest, police said the protesters today left the area peacefully.