The armed offenders squad has been called out to a firearm incident in Invercargill.

St John Ambulance said one person has been injured in the incident and was rushed to Invercargill Hospital in a critical condition.

However police said tonight that the man was now in a "serious" condition, meaning that his condition was no longer life-threatening.

"Police and ambulance were called to the scene on Drury Lane, Grasmere, around 3.30pm today," a police spokesman said.

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"The armed offenders squad responded to assist as a precaution. Police are working to locate a person of interest in relation to the altercation."

A spokeswoman said earlier that a firearm was involved in the incident.