Prime Minister Tony Abbott and his wife, Margie, pay their respects at the Martin Place memorial site on Tuesday in Sydney, Australia. Jennifer Polixenni Brankin/Getty Images hide caption

itoggle caption Jennifer Polixenni Brankin/Getty Images

A hostage runs to armed tactical response police officers for safety after she escaped from a cafe under siege at Martin Place in the central business district of Sydney, Australia, on Monday. Rob Griffith/AP hide caption

itoggle caption Rob Griffith/AP

Russian President Vladimir Putin looks to his side during the family photo session of the G-20 summit in Brisbane, Australia, on Saturday. Putin was sternly criticized by Western leaders over Moscow's involvement in eastern Ukraine. Rob Griffith/AP hide caption

itoggle caption Rob Griffith/AP

These scuba divers are among the 2 million tourists who visit the Great Barrier Reef each year. They contribute about $5.6 billion to Australia's economy, according to the Queensland government. Steve Dorsey for NPR hide caption

itoggle caption Steve Dorsey for NPR

Australia is no longer processing new visa applications from the three worst-hit countries in Africa's Ebola outbreak. Here, a jetliner prepares to land at Sydney's international airport. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

A photo made available on Monday of the Fugro Discovery search vessel moored at Fremantle Port in Perth, Australia. The vessel is one of three that will resume the search for possible wreckage from MH370. Angie Raphael/EPA/Landov hide caption

itoggle caption Angie Raphael/EPA/Landov

New South Wales Police Commissioner Andrew Scipione (right) and Australian Federal Police Acting Commissioner Andrew Colvin describe how 800 federal and state police officers raided more than two-dozen properties as part of the operation Thursday in Sydney. Rick Rycroft/AP hide caption

itoggle caption Rick Rycroft/AP

Australian Prime Minister Tony Abbott speaks during a news conference in Sydney last week. Abbott has announced the deployment of 190 police to help secure the MH17 wreckage site, where 37 Australians were killed. Rob Griffith/AP hide caption

itoggle caption Rob Griffith/AP

An oil refinery is pictured in the southern Sydney suburb of Kurnell earlier this week. Australia's Senate voted on Thursday to scrap the country's carbon tax and plans for emissions trading — a major victory for conservative Prime Minister Tony Abbott. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

Sri Lankan asylum seekers who were sent back by Australia cover their faces as they wait to enter a magistrate's court in Galle, Sri Lanka, on Tuesday. Reuters /Landov hide caption

itoggle caption Reuters /Landov