One person is in a critical condition after a serious crash on Matakana Road in Warkworth, north of Auckland.
"Initial indications are that there are multiple vehicles involved," police said in a statement on Tuesday morning.
The vehicles collided at around 9am.
A section of Matakana Road, between Sandspit Road and Sharp Road, is currently closed and is expected to be closed for some time, police said.
"Expect delays on #SH1 through Warkworth due to diversion queues from a serious crash which has required the closure of access to Matakana Rd," the New Zealand Transport Agency (NZTA) said in a tweet shortly after 10am.
"Traffic to/from Matakana must use Sandspit Rd and Sharp Rd as alternative route."
Motorists are advised to avoid the area.
