The Serious Crash Unit has been advised.
“Diversions are in place and motorists are asked to avoid the area,” police said.
A Hato Hone St John spokesperson confirmed they sent one ambulance and two rapid response units to the scene of the crash.
It comes after one person died this morning following a two-vehicle crash on State Highway 23, near Māori Point Rd, Whatawhata.
Police said they received a report of the crash around 9.15am on Sunday.
Waka Kotahi New Zealand Transport Agency said SH23 was closed between Horotiu Road and Te Pahu Road due to the crash.
Police said enquiries into the circumstances of the crash were ongoing, and the road remained blocked while the Serious Crash Unit examined the scene.
The road re-opened around 2.45pm this afternoon.