After being told of the test results Thursday, transport security officials ordered the plane's return to Sydney, where the passenger's luggage was screened and cleared, the Australian Broadcasting Corp. reported.
Transport Minister John Anderson said there was a breakdown in communication involving those responsible for airport screening.
"But what I want to stress is that the minute Australian Government officials became aware of the incident and of the breakdown, action was taken," he said.
Korean Airlines said it was not advised of the breach prior to the flight's departure.
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