Update: The fire alarm at Bayfair shopping centre has now ceased, a SunLive reader reports.

"The fire service has now departed," says the reader.

"Everyone has gone back inside and business has resumed.

"From what I could see, at least 200 people were evacuated."

Earlier:

Bayfair is being evacuated, a SunLive reader reports.

Fire and Emergency New Zealand are at the scene.

The reader suspects a fire alarm has been activated.