The woman most seriously injured of seven hurt in Friday's head-on car crash near Gisborne remains critically ill in the intensive care unit at Waikato Hospital.

The crash happened moments after a police patrol car began to pursue one of the cars for alleged speeding.

The seven people, including two children, were injured when the cars they were in collided on a slight bend just south of Te Karaka, 25kms inland from the city on SH2.

A 21-year-old woman in one of the vehicles was flown out to Waikato Hospital that night.

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"She is in our ICU and remains in a critical but stable condition," a Waikato spokeswoman said this morning.

The other six were also admitted to hospital and remain there today.

"They are all still in a stable condition," a Gisborne Hospital spokeswoman said this morning.

The six are three men aged 38, 26 and 21, a woman aged 18, a four-year-old boy and a seven-year-old girl.

They suffered a range of moderate to serious injuries.

Police have begun a serious crash investigation and the Independent Police Conduct Authority was advised.

- Gisborne Herald