One person has died in a crash involving a ute towing a caravan in Omarama.
Emergency services were called to the single-vehicle smash on Twizel-Omarama Rd, at 12.30pm.
A police spokeswoman said another person was injured and needed treatment.
The road will be closed and motorists should expect significant delays.
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"Please continue to avoid the area and consider delaying travel."
A Fire and Emergency New Zealand spokesman said two crews free the trapped occupants of the ute.