One person has died following a crash on State Highway 1, Tokoroa.
The crash, involving a pedestrian and a car, occurred just before midnight last night.
A second pedestrian initially suffered moderate injuries - but their condition has since worsened and they are now in a critical condition, according to a police spokesperson.
"The road has since been reopened.
"Inquiries into the circumstances of the crash are under way."
Emergency services also responded to a serious crash in Auckland overnight.
Police and St John were called to East Tamaki Rd near Preston Rd in Otara after a car collided with a tree shortly before 2am.
Meanwhile, today emergency services are at the scene of a serious crash on State Highway 2 in Putorino, Hawke's Bay.
The single-vehicle crash near Haliburton Rd was reported about 10.40am.
"Initial reports indicate there are injuries," a police spokesperson said.
"The road will be closed and traffic management will be in place."
Police have advised motorists to avoid the area if possible.