The bomb threats turned out to be a hoax, but Queensland Premier Peter Beattie said the public transport shutdown had provided a timely counter-terrorism exercise.
Police ordered services stopped around midday, after the first threatening phone call was received from a public telephone, The Australian reported. They remained stopped for more than 90 minutes.
All bus and train services were again suspended and passengers evacuated from all stations between 4:30 p.m. and 5:15 p.m. in response to the anonymous calls, causing confusion for thousands of peak-hour commuters.
Beattie admitted the authorities were over-cautious in responding so dramatically to what they suspected was a hoax, but added, "I would rather be over-cautious than have someone's life or lives on our conscience."
The instigator of the prank calls could face up to seven years in jail, if caught.
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