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SYDNEY, NEW SOUTH WALES - JULY 30:  Police guard the passenger security check area at Sydney Airport on July 30, 2017 in Sydney, Australia. Counter terrorism police raided four houses across Sydney on Saturday night and arrested four men over an alleged terror plot that involved blowing up an aircraft. Australian travellers have been warned to expect major delays at airports around the country with security screening measures ramped up following the raids.  (Photo by Brook Mitchell/Getty Images)
SYDNEY, NEW SOUTH WALES - JULY 30:  Police guard the passenger security check area at Sydney Airport on July 30, 2017 in Sydney, Australia. Counter terrorism police raided four houses across Sydney on Saturday night and arrested four men over an alleged terror plot that involved blowing up an aircraft. Australian travellers have been warned to expect major delays at airports around the country with security screening measures ramped up following the raids.  (Photo by Brook Mitchell/Getty Images)

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    Police disrupt terrorist plot in Australia

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Police disrupt terrorist plot in Australia

Australian police explain what they say was "one of the most sophisticated plots that has ever been attempted on Australian soil." CNN's Anna Coren reports.

Police disrupt terrorist plot in Australia

Australian police explain what they say was "one of the most sophisticated plots that has ever been attempted on Australian soil." CNN's Anna Coren reports.