About six police men and women are gathered outside the back entrance of a central Auckland building.
A police spokeswoman at the scene said a woman was found injured in the stairwell, which is now blocked off by emergency tape.
Police say an investigation is underway into what happened to the woman, and could not comment further at this time.
The stairwell is at the back of The Peaks, an apartment building on Victoria St West.
By-standers were confused about the sudden police presence but did not know what had happened.