Emergency services have been called to a serious crash south of Hawke's Bay.

Police were called about the crash on SH2, 4km south of Norsewood in the Tararua district, about 10.40 this morning.

The section of highway is currently closed as a result of the crash. It is believed two cars were involved, however there were no details on injuires as yet.

Diversions were being established and motorists were asked to avoid the area.

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The crash occured near the settlement of Matamau, opposite some paddocks belonging to the Holmes'.

"I heard a very big bang," Eileen Holmes said. "I saw a car at an angle, and some other cars stopped. People were trying to open the door of the car but they couldn't."

She said it looked like one of the cars had hit a fence as a result of the crash.

Traffic was backing up, and there were multiple emergency services at the scene - she counted three police cars, two ambulances and two fire engines.

More soon