A woman has been taken to Nelson Hospital in a serious condition after an attack by bees or wasps on Nelson's Tahunanui Beach.
The attack happened on Bisley Walk around 12pm when a number of people, including children, were stung.
St John sent two ambulances and two rapid response vehicles to the scene.
Spokesman Ian Henderson confirmed 10 children aged under 10 had been taken to Nelson Hospital as a precaution.
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A number of other children were collected by family members from the scene, he said.