A police spokesman said they were called to the incident, about 8 kilometres west of Opotiki, just after 6am when a vehicle crashed into the slip.
It was not known if anyone was hurt - the spokesman did not have any further details and St John Ambulance couldn't be contacted.
Police had left the scene by 9am.
Emergency services were also called to southeast Auckland last night, after five people were hurt in a two-car crash at Whitford Maraetai Rd and Henson Rd at 11.30pm.
One car rolled and some people were trapped following the crash, the spokesman said.
St John Ambulance tweeted that they took five people to Middlemore Hospital. One had serious injuries and two had moderate injuries.
Two other people received minor injuries.
In the third overnight crash the trapped driver of a car was rescued after crashing into a tree.
The crash occurred about 11.40pm on the State Highway 4 and Mapara North Rd area of Kopaki, south of Te Kuiti.
No one was hurt in the crash, the police spokesman said.