One woman is dead and two toddlers have been injured in a crash south of Auckland.

Police said the fatal collision between a car and a truck happened at 3:23pm on Mill Rd in Totara Park.

Emergency services had to free the car occupants after the crash.

A woman died at the scene, police said.

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Two children, aged 12 months and 18 months, had been taken to Middlemore Hospital with moderate to serious injuries.

The truck driver was not injured.

Serious Crash Unit investigators were at the scene and the road was expected to remain closed for at least three hours.

- nzherald.co.nz