UPDATE 5.12PM: One person has died following the earlier two-vehicle crash on SH1, Tirau.

Another person reportedly sustained serious injuries.

"The Serious Crash Unit is examining the scene, and the road is expected to remain closed for some time," says a police spokesperson.

"Diversions remain in place.

"Motorists should continue to avoid the area."

EARLIER 3.33PM: Emergency services are at the scene of a serious two-vehicle crash on SH1, Tirau.

Police were called about 3.12pm.

"The road is closed and diversions are being put in place."

Motorists should avoid the area.

According to Google Maps, traffic is building up in the area.

Image: Google Maps.