An investigation's been launched into the police operation which ended the Sydney cafe siege, in which two hostages died.
The victims have been named as Tori Johnson, the 34 year old manager of the cafe, and Katrina Dawson, a 38 year old lawyer.
The hostage taker Man Haron Monis also died.
He was a known extremist and Australian Prime Minister Tony Abbott says part of the investigation will focus on whether he could have been stopped.
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He was a known extremist and Australian Prime Minister Tony Abbott says even though the attacker was known to authorities, that doesn't necessarily mean the incident could have been prevented.
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