An urgent review has been ordered by the Australian government to answer a number of "obvious questions" about what could have been done to prevent the deadly siege at a Sydney café.
Prime Minister Tony Abbott said he and Premier of New South Wales Mike Baird have both now commissioned their respective secretaries to conduct the investigation.
In a press conference, Mr Abbott said the review would address how gunman Man Haron Monis was granted permanent residency, how he managed to stay on welfare for so many years, why he dropped off the security forces' watchlist in 2009, and how he got hold of a legal gun licence, among other issues.
It does need to be thorough. It does need to be swift. We do need to put the lessons into practice as soon as we can.
I will not rest until I am confident that you are as safe as any government can possibly make you.
He said the report is expected to be completed by the end of January.
The first hostage to escape the siege in Sydney in which three people including the gunman died has spoken of his relief at his release
The dramatic moment armed police brought the Sydney siege to a bloody end has been caught on camera.
"It was pretty loud, pretty frightening - like nothing I'd ever seen before ever," Greg Parker said.