"We are taking appropriate measures to keep everyone on the premises as safe as possible."
Police are appealing to the public for any photos and videos of the incident.
The person suffered critical injuries and died in hospital.
Protesters want the Government to do more than just pause SNAs and scrap them altogether.
SNAs have recently been in the news a lot as concerns have been raised about implications for private land owners.
"We don't need a heavy hand to come over the top and tell us how to care for our whenua."
The publican has previously faced criticism for misspelling Māori words on Facebook.
The Energy Minister said these risks are not significant, but a consultant's report to the government says the opposite.
State Highway 1 has been closed between Kaiwaka-Mangawhai Road and Mangawhai Road, Te Hana.