It appears two vehicles were involved in the crash.
Two people have been injured - one with moderate injuries and the other has suffered minor injuries.
One of the vehicles was reported to be blocking the passing lane.
The crash has happened near Maniatutu Rd and Allport Rd.
A crash on State Highway 33 north of Okere Falls. Photo / SuppliedShe said St John had been called to the scene.
It appears the crash has happened close to the "rest stop" near Okere Falls, the spokeswoman said.
The reporter at the scene said emergency services had arrived.
Emergency services at the scene of crash on SH33 near Okere Falls. Photo / Supplied