Police have arrested a 38 year old man at a Koromiko address in relation to a threatening telephone call directed at Work and Income staff in Blenheim this morning.
Armed Offenders Squad members surrounded the Koromiko house and arrested the man shortly after 1pm.
The Work and Income offices in Blenheim are no longer in lock down.
Detective Senior Sergeant Ciaran Sloan said WINZ staff never faced any direct threat and the lock down was a precautionary measure to ensure staff safety until an arrest was made.
No charges have yet been laid.
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