One of the cars car involved in a deadly crash on a suburban Auckland road looked to be speeding at 100km/h mere moments before impact, a witness says.

One person died in Great South Rd collision between two cars in Ōtahuhu, while four others were injured - including three critically.

A woman driving in the other lane said she saw one of the cars speeding in the opposite direction at about 7.40pm last night.

It “literally looked 100km/h”, she told the Herald about the car’s speed.

“And then I just heard a loud bang, but I didn’t see how it crashed,” she said.

Emergency services arrived shortly afterwards, with police saying one person died at the scene

Three people also suffered critical injuries, while a fourth had moderate injuries.

All four were taken to hospital.

Inquiries into the circumstances of the crash were ongoing, police said.

Emergency teams at the site of a fatal crash on Great South Rd in Ōtahuhu. Photo / Hayden Wooodward

Second Auckland crash an hour later

Soon after the fatal Ōtahuhu crash, emergency teams were also called out to another serious two-vehicle collision in west Auckland’s Oratia.

The crash, near the intersection of West Coast Rd and Kairi Loop Rd, was reported to police around 8.45pm yesterday.

One person is in a critical condition and two people have serious injuries.

“The road will be closed for several hours while emergency services work at the scene,” police said late last night.