A man was shot dead by police this morning after approaching officers with a weapon, north of Auckland.

Police said they provided first aid but the 29-year-old man died at the scene from his injuries.

The man had approached the officers at Pohuehue.

A section of State Highway 1, between Puhoi and Warkworth, has been closed since 4am as police deal with the incident.

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Warkworth resident Becky Watson said she heard helicopters in the area at 4am.

"[They were] flying so low it woke me up."

Further information will be provided by Superintendent Tusha Penny, Waitemata District Commander, at a media conference later today.

State Highway 1 is closed between Woodcocks Rd and Silverdale.

Diversions are in place for southbound traffic at Woodcocks Rd, where traffic is being diverted on to SH16.

For Northbound traffic, there is a diversion in place at Silverdale, where traffic is being diverted to Kahikatea Flat Rd, through to SH16.

Earlier, a police spokeswoman said the road was closed because of a "police operation underway on SH1".

"We don't have any further details we can provide at this stage, but we will provide more information as soon as we can."