Update: Police arrested a man this afternoon and charged him with threatening to kill.
It was yet to be decided when he would appear in court.
Update: The branch would remain closed to the public for the remainder of this afternoon but ACC staff were still hard at work at their desks, senior media advisor Stephanie Melville said.
The Child, Youth and Family office next door was also closed.
Earlier: Tauranga ACC is in lockdown following a threat to the Grey St branch this afternoon.