First responders are hugely resilient – but here's what to do when the memories become too much.
Malcolm Turnbull has asked Australian law enforcement agencies to test their responses to a mass casualty attack in the wake of the killings in Paris and elsewhere.
Selective sympathy raises troubling questions. If you neglect suffering in other places, it is much more difficult to mobilise political actors to take it seriously.
Preventive measures such as control orders should not be extended in the absence of evidence for their need or without safeguards.
Like France, the US faces the possibility that ISIS will attack an American city sooner or later.
Paris police were able to use information found on a phone, but what details can be found that could tackle future attacks?
Terrorist groups aim to incite both terror and power-projection. Such deadly tactics also hope to spark an over-reaction that will feed into their propaganda and divide societies.
Many Western policies that aim to prevent terrorism may actually be causing it.
An apocalyptic vision drives the terrorist group.
ISIS uses the internet, especially social media, to propagandize and recruit. Members of hacker group Anonymous have turned their sights on these accounts.
After November 13, teachers in France asked themselves how they could talk to their students about the violence. The answers are both creative and deeply moving.
Islamic State terrorism and propaganda are designed to provoke often predictable responses. We naturally respond with displays of outrage and solidarity, but we should beware the trap of division.
Less is often more – acting quickly in the wake of atrocities rarely leads to good laws.
The tools that protect people's privacy on social media are being used by terrorists to spread their messages of hate and attack.
Increased resources and staffing is a start but security must be properly targeted and accountable to the British people.
The sad truth is that it's all too easy to get hold of automatic weapons in Europe.
Lebanon has been coming apart at the seams for years – Islamic State is trying to make it disintegrate entirely.
Islamic State is as resilient and effective as any terrorist group we've seen. How has it made itself so strong?
In the next few weeks we may see a resurgence of rhetoric calling for more resources to fight the War on Terror following the Paris attacks. Islamophobia may take deeper root in Europe as a whole.
Islam, like Christianity, has a capacity for violence and a capacity for peace, and neither is in essence peaceful or violent.