A large police operation has taken place at the Yellow Pages building in Ellerslie, Auckland.
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A witness said a large number of police had closed of the staff carpark for the building, at 604 Great South Road.
"They've been walking all around the Millenium Centre complex, and even through our car parking tower just looking around and over the sides," the witness said.
Police have not yet responded to requests for information.
By 10am most of the police had left the scene, the witness said.