Greyhound Racing New Zealand chief executive officer Edward Rennell confirmed the incident.
“As a result, two women - a trainer and an official - were assaulted,” he said.
“The key priority for GRNZ is providing a safe environment for our greyhounds and our people.
“We acknowledge all people have the right to a peaceful protest, but we do not accept attempts to access other’s personal property illegally or common assault or any other breaches of the law.”
Rennell could not comment further as the matter was with the police.
Anna Leask is a Christchurch-based reporter who covers national crime and justice. She joined the Herald in 2008 and has worked as a journalist for 18 years. She writes, hosts and produces the award-winning podcast A Moment In Crime, released monthly on nzherald.co.nz