A 10-year-old was among people who witnessed an attack at their local dairy this morning, in Auckland's New Windsor.

A 24-year-old man's been charged with wounding with intent to cause grievous bodily harm and resisting police.

A man and woman are stable in hospital and the man reportedly has stab wounds.

Herald reporter Raphael Franks says he spoke to witnesses at the scene, who saw the alleged perpetrator stagger out of the shop.

"And when they did, they were terrified that he was going to be coming for them. And they also saw one of the victims wheeled out from the shop on a stretcher."

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