SYDNEY, Nov 18 — National Australia Bank (NAB) said today it had temporarily closed all its branches and attached offices due to a "physical security threat”, but did not give further details.

Australia’s second-biggest lender said it was working with police and is inspecting all of its branches and commercial offices to make sure they are safe to return to.

Queensland police told The Australian newspaper that a number of NAB branches in the state reported bomb threats.

As and when they are deemed safe, "we will advise our colleagues located in each of these they can return and locations will be progressively reopened to customers,” Australia’s biggest bank for corporate clients said in a statement.

NAB has over 600 branches across Australia.

The bank’s internet and mobile banking were working as usual, it said. — Reuters