Thousands of people joined a march towards New Zealand’s national capital on Friday after a contentious bill that would reinterpret the country’s 184-year-old founding document passed its first hurdle in parliament.

Several rallies against the Treaty Principles Bill are being staged in towns across the country as a nine-day march, or hikoi, moves to Wellington. It is expected to reach the national capital on Tuesday.

An estimated 10,000 people marched through Rotorua, about 450 km (280 miles) north of Wellington, New Zealand police said in a statement. Protesters, some wearing traditional clothing, were greeted by hundreds waving the Maori flag and chanting.