Emergency services swarmed an Auckland early childhood centre, after a refrigerant gas leak injured three adults, two seriously

They are are in North Shore hospital, but no children are harmed.

Herald reporter Raphael Franks says fire teams and St John have now left Hillcrest's Caterpillars to Butterflies, but Police remain.

He says officers have been coming in and out of the building and talking to the owner.

A staff member says some teachers were made unwell.