Police said they had received three separate threats Thursday, including one by e-mail targeting the busy subway station, The Australian reported.
New South Wales Deputy Police Commissioner Terry Collins said police had thoroughly investigated the threats and found them to be fakes. He appealed for calm, reassuring city residents they would be informed immediately of any real threat against the city.
Prime Minister John Howard said Wednesday that his government and security agencies had received information suggesting a terrorist cell was planning an attack on Australia.
Collins warned that spreading fear by making false threats was a crime and would bring a harsh penalty.