Inquiries are ongoing into the fatal crash which killed three people on Mangaharakeke Road in Hamilton just after midnight on Sunday.

The man driving of the Holden Trax in which three people were killed, was admitted to Waikato Hospital with moderate injuries.

He is being offered support and is helping Police with inquiries, says Inspector Marcus Lynam.

"Police is not yet in a position to formally release the names of the three deceased.

"The male driver of the other vehicle involved in the crash was also admitted to Waikato Hospital with moderate injuries."

He is believed to have driven down from Auckland, and Police continue to ask for anyone who witnessed a blue and grey Toyota Prada driving erratically or at speed late on Saturday or early Sunday, to come forward.

The driver of the Toyota is also helping Police with inquiries.

No charges have been laid at this stage.

CIB and the Serious Crash Unit are working to establish the circumstances of the crash.

"The investigation into the crash is complex, and is expected to take some time," says Marcus.

"We extend our condolences to the families involved, and have offered them support."