Armed police have been called to Rangiuru after police were alerted to an incident involving a group of workers being confronted by a man with a firearm.

A police media spokeswoman said there was a police presence in Rangiuru after the report was received about 11.40am today.

"Police are searching for the man believed to be involved, and AOS have been deployed as a precaution," the spokeswoman said.

She said there was not believed to be risk to the public and inquiries were ongoing to speak to everyone involved.

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"Police are working to locate the individual involved and do not want the public to be alarmed."