The Work and Income building in Rotorua is in lockdown after a threat was made to staff.
A person made a threat to staff in the building on Friday morning, a police spokeswoman said.
The person who made the threat has left, but the office remains closed, as is standard procedure, she said.
One customer, who posted to Neighbourly, said she needed to get of the office for her children's safety.
"They are not letting anyone inside near doors and windows. Only letting people leave thru back entrance."