On top of the agenda of the Global Counter-Terrorism Forum was ways to stop the recruitment of foreign fighters to Iraq and Syria.
Foreign Minister Julie Bishop says about 120 Australian citizens are fighting for or engaged with what she calls terrorist groups in the two countries.
She says that is double the number reported last year.
Renewing the global commitment to destroy the self-proclaimed Islamic State, or IS, was the goal of the forum.
Australia joined 29 other countries to work on new ways to stop what they deemed the life cycle of terrorism.
That life cycle was seen to range from online encouragement and enlistment of militants to the reintegration of returning fighters.
Foreign Minister Julie Bishop says the number of Australian citizens joining I-S, also known as Daesh, (di-ESH) has doubled in the past year and more must be done to stop the flow.
"We're currently assisting the Iraqi government in its efforts to defend its people against violent attacks perpetrated by Daesh, including through air strikes. We must also stop the unrelenting flow of foreign terrorist fighters travelling to Iraq and Syria, further inflaming the conflict and the scale of the humanitarian disaster."
United States intelligence suggests nearly 30,000 foreign fighters have travelled to Iraq and Syria since 2011, many of them to join IS.
That is double the previous estimates.
At least in Australia, Ms Bishop says she expects that trajectory to slow as efforts to prevent potential fighters from getting access to passports begin to take effect.
"We have been cancelling passports. We have been successful in the number of interventions through our security law-enforcement and intelligence agencies work. So, the numbers are still increasing, but we hope to stem the trajectory through our efforts."
US Secretary of State John Kerry says he wants to see more work to stop the recruitment of vulnerable young people.
"We've got to move faster and address a broader array of the tools that are used by terrorists, and one of the tools, no surprise, is their effective use of social media and more traditional mechanisms in order to try to radicalise tens of thousands of people."
Australia is also working with Indonesia on intervening in jails.
It is sharing ideas with its neighbour about how best to rehabilitate convicted terrorists.
Ms Bishop says forums like the Global Counter-Terrorism Forum are important so countries can collaborate in their efforts.
"Australia is not immune from the threat of terrorism, and all nations face a risk in some form or another. Thirty-thousand foreign terrorist fighters are drawn from at least a hundred countries around the world."
European Union foreign-policy chief Federica Mogherini says European countries can learn from their partners when it comes to stemming the flow of foreign fighters to Iraq and Syria.
Ms Mogherini has criticised those in Europe who claim the humanitarian crisis there could bring what they term extremists onto European soil.
"But some in Europe in these weeks are telling our citizens that terrorism will land on our continent on a sailboat packed with refugees or migrants, while, in recent years, Europe has exported foreign fighters, not imported them. And there is a lot we can learn from our partners in the region on how to manage this."
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