All NAB branches across Australia have closed and been evacuated after a physical security threat.
"Unfortunately we have had to close our branches temporarily due to a physical security threat," the bank posted on Twitter.
"As always the safety and security of our customers and colleagues is our priority.
"We are working closely with police and will provide an update as soon as we can."
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The bank has not determined the location or the exact nature of the threat.
Internet, mobile and telephone banking remain unaffected.
There is one NAB branch in Dubbo, located in Macquarie Street.
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