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STORY HIGHLIGHTS
- The hostages who died are identified as Katrina Dawson and Tori Johnson
- All of those injured are described by police in stable condition
- "It will take time to clarify exactly what happened ... and why," PM says
- The gunman's social media postings reflect a radical Sunni extremist theology
Sydney (CNN) -- The deadly siege of a central Sydney cafe has ended but the investigation is just beginning.
Australian authorities stormed the cafe where a self-styled Muslim cleric had been holding hostages early Tuesday, killing the gunman. They moved in some 16 hours after the siege began, after hearing gunfire inside the Lindt Chocolate Cafe, New South Wales police Commissioner Andrew P. Scipione told reporters.
Two of the 17 hostages initially held by the gunman died, according to Scipione. They were later identified as Katrina Dawson, 38, and Tori Johnson, 34. Other people were injured, including a police officer who suffered a wound to the face from gunshot pellets. All were described by police to be in stable condition.
Man Haron Monis.
"Understandably, there is a lot of speculation, but it will take time to clarify exactly what happened ... and why," Australian Prime Minister Tony Abbott told reporters Tuesday.
What did the gunman want? Why did he choose the cafe as his target?
"There is nothing more Australian than dropping in at the local cafe for a morning coffee, and it's tragic beyond words that people going about their everyday business should have been caught up in such a horrific incident," Abbott said.
He offered his condolences to people caught in the attack and to their loved ones.
"These events do demonstrate that even a country as free as open as generous and as safe as ours is vulnerable to acts of politically motivated violence," the Prime Minister said. "But they also remind us that Australia, and Australians are resilient and we are ready to respond."
Gunman had violent history
The gunman was identified as Man Haron Monis by an official with direct knowledge of the situation. According to his social media posts, the hostage-taker appears to have embraced a radical Sunni theology.
Abbott told reporters that the gunman was already well-known to authorities, and that he had a "long history of violent crime, infatuation with extremism and mental instability."
Before the raid, Monis had demanded a flag and phone call with Abbott, CNN affiliate Sky News Australia reported. He made the demands through hostages who contacted media organizations, Sky News reported.
Some hostages had also reportedly posted messages to social networking sites and the YouTube online video service. Police urged media early Tuesday not to show the videos.
Monis, also known as Sheikh Haron, pleaded guilty in 2013 to writing letters to relatives of Australian service members saying they were "Hitler's soldiers," according to Australian media reports.
He was believed to be acting alone, and he didn't appear to be part of a broader plot, additional U.S. law enforcement and intelligence sources said.
The scene in Sydney: Grenades and gunfire
How the siege unfolded
Hundreds of police officers, including snipers, surrounded the cafe in Sydney's central business district shortly after the gunman took over the building at 10 a.m. Monday (6 p.m. ET Sunday).
Chilling images from Australian media showed people, believed to be hostages, with their hands pressed against the cafe's windows. They were holding up a black flag with Arabic writing on it reading, "There is no God but God and Mohammed is the prophet of God."
Five hostages sprinted out of the cafe toward heavily armed police officers several hours into the standoff, sending the gunman into a tirade, according to an Australian reporter.
Chris Reason, a correspondent for CNN affiliate Seven Network, said the gunman became "extremely agitated" when he realized what had happened and "started screaming orders" at the remaining hostages.
Reason said he could see the gunman pacing past the cafe's windows from his vantage point at the network's nearby offices. He described the man as unshaven, wearing a white shirt and black cap and carrying a shotgun.
As night fell, lights went out in the cafe, Reason reported.
After a tense night, police could be seen early Tuesday throwing flash-bang grenades into the cafe in video aired by Seven Network. Gunfire erupted amid the chaos.
A national security source in the United States said that a team of Australian special forces troops and police had entered the Lindt Chocolate Cafe from two directions and killed the gunman.
Video captured medics working on some people and others being carried away on stretchers.
On Tuesday, the hostages who died were identified as Dawson and Johnson.
"Katrina was one of our best and brightest barristers who will be greatly missed by her colleagues and friends at the NSW Bar," the New South Wales Bar Association said in a statement. "She was a devoted mother of three children and a valued member of her floor and of our bar community. Our thoughts are with her family at this time."
Johnson's family also released a statement. It read, in part: "We are so proud of our beautiful boy Tori, gone from this Earth but forever in our memories as the most amazing life partner, son and brother we could ever wish for."
CNN's Anna Coren reported from Sydney, Michael Pearson reported and wrote from Atlanta, and Jethro Mullen reported and wrote from Hong Kong. CNN's Dana Ford, Hilary Whiteman, Euan McKirdy, Chieu Luu, Elizabeth Joseph and Khushbu Shah also contributed to this report.