Australian Prime Minister Tony Abbott has launched a review into security checks carried out on the Sydney cafe hostage taker.
Man Haron Monis was not on any watch list despite a criminal record, history of violence and extremist views.
Monis was killed as police raided a cafe in which he'd taken hostages on Tuesday.
Two hostages also died.
According to Iran - where Monis was originally from - Australia refused to extradite him 14 years ago.
Launching an inquiry into any background checks carried out, Prime Minister Abbott vowed to do everything in his power to keep Australians safe.
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