Police after the London Bridge attack on June 4, 2017.
Anti-terrorism policy is too often adopted based on very small sets of data – and fear.
Law enforcement officers move in to verify the identity of people in a field outside the Fort Lauderdale airport after a mass shooting.
New ways of expressing discontent are constantly emerging. Could mass shootings join what sociologist Charles Tilly has dubbed the 'repertoire of contention'?
A makeshift memorial for the Sandy Hook victims on the first anniversary of the massacre.
Robert F. Bukaty/AP
Even after 26 children and teachers were killed four years ago today at Sandy Hook, more mass shootings by disturbed white men and boys have occurred. Ignoring this crisis has severe consequences.
Anders Breivik, pictured in 2016.
New study finds potential cause of Breivik's crimes.
What’s in the mind of a solo attacker?
Man with gun image via shutterstock.com
Lone offender – sometimes called "lone wolf" – attacks may become a more prevalent threat. What can we understand about them and the people who carry them out?
Aerial view of the Pentagon, September 14, 2001.
The National Incident Management System (NIMS), created after 9/11, has helped government agencies respond to large-scale emergencies, including mass shootings and the Boston Marathon bombing.
James Holmes was a psychiatric patient at the time he shot 24 people dead in the Aurora Picture House shooting in 2012.
EPA/Arapahoe County Sherriff's Office
Telltale signs can identify people at risk of committing extreme violence.
Whenever firearm control is raised, the gun lobby turns to the US Constitution.
How hard should it be for the FBI to get access to your iPhone’s data?
The court order to Apple is consistent with the existing law and previous Supreme Court decisions.
Legal or illegal, the US is awash in guns.
Though the perpetrators of the mass shooting in California appear to have acquired their guns legally, the vast majority used in violent crimes are obtained illegally.
A memorial for 20-year-old UCSB student Christopher Michael-Martinez one of nine crime scenes in the Isla Vista neighborhood of Santa Barbara, California in 2014.
America’s gun violence problem actually is producing policy reform. It's just that most of this activity is happening on the state level and has received little attention in the national media.
A killer’s use of TEC-9 assault pistols convinced Californians to repeal immunity for gunmakers. Then Congress overruled them.
Finding solutions for what happened in San Bernardino is a challenge, but ensuring gunmakers behave responsibly should be one piece of the puzzle.
Metro Shooting Supplies employee Chris Cox speaks to a customer about the purchase of a 9mm handgun in Bridgeton, Missouri, November 13 2014.
Research on background checks for gun purchases suggests there is an increase in gun acquisition a few months after a mass shooting happens.
A longing for power and social status mixed with hormones and fear can have deadly consequences.
'Man' via www.shutterstock.com
Why is there always a man behind the trigger? And why is it almost always a young man?
Hungry for information: the media, here covering the shooting in Oregon, falls into now-familiar patterns in covering mass shootings.
The media repeatedly creates instant profiles of public shooters as shy, troubled loners, perpetuating the sense of helplessness over mass killings.
A vigil for the victims of a mass shooting in Umpqua Community College in Roseburg, Oregon.
President Barack Obama has praised gun laws in Australia and the UK. How did they work?
Barack Obama has challenged the US media on gun laws, but despite the First Amendment, journalists are too scared to speak against abuse of the Second Amendment.
A memorial to murdered journalists Alison Parker and Adam Warm lies outside the offices of WDBJ7.
New research suggests mass shootings are not just due to gun ownership, but gun culture.
Guns don’t stop gun violence.
Other 'advanced nations' make it far harder for someone like the Charleston killer to get his hands on a Glock semiautomatic handgun or any other kind of firearm.
Someone’s son too, but how can the families of mass killers grieve?
The mounting flowers and candles in Isla Vista mark the mourning of six university students killed in the mass shooting at the University of California, Santa Barbara, and sympathy for the other 13 who…