UPDATED: Police can now confirm one person has died following the serious crash at the intersection of Woodstock Road and Harmans Gorge Road, Waimakariri.
The Serious Crash Unit is investigating.
One person is believed to be in critical condition following a serious crash in Waimakariri.
Emergency services are attending the scene of a serious crash involving a car and a truck at the intersection of Woodstock Road and Harmans Gorge Road.
Police were called to the scene about 11.40am.
"Initial reports indicate one person is critically injured, and another person is understood to be seriously injured," says a police spokesperson.
"The Serious Crash Unit has been advised.
"The road is expected to be closed for some time, with diversions being put in place."
Motorists are advised to avoid the area.