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Armed police have been called to the Blenheim Work and Income office after a telephone threat was made to a worker.
Police spokeswoman Barbara Dunn said the office had been shut down by police.
"Armed police are keeping it secure and the Armed Offenders Squad are working to identify and locate the caller," she said.
The office is located at 3 Alfred Street.
The telephone threat comes after two Winz workers were killed and a third seriously injured in a shooting at the Ashburton office yesterday.