A car does burnouts on the video, claimed to be from a boy racer gathering north of Napier.
Burt said they'd had to put diversions in place while the event was occurring, inconveniencing motorists who were forced to take rural back roads to avoid the road.
"One police patrol vehicle was damaged when it was set upon by several of the group after being caught up in the event attempting to get through to warn motorists approaching from the north. Thankfully no police staff were injured."
So far police have seized four vehicles and made four arrests, and say more could be to come.
Damage done to the highway following a gathering of boy racers on State Highway 2. Photo / Paul Taylor