Three questions raised by the capture of Cholo Abdi Abdullah.

Twenty-one months after the bloodiest terrorist attack in New Zealand’s history, a government commission has released a lengthy postmortem of what went wrong.

If Al-Qaida leader Ayman al-Zawahri is in fact dead, where will al-Qaida go next and what kind of movement will Zawahri’s successor inherit?

How can the U.S. build a sustainable and cost-effective counterterrorism operational concept?  

There’s a ton of online fundraisers for women affiliated with the Islamic State. Many of these fundraisers take place relatively openly on social media.

The Anti-Defamation League’s monitoring of extremist groups suggests that election-motivated violence could yield more domestic terrorism threats, which if fully realized, could pose a threat to ensuring...

There was some good news—as well as some troubling details— in the Sept. 17 hearing on "Worldwide Threats to the Homeland."

The pandemic has slowed global travel significantly. But a few determined individuals show that the terrorism threat posed by American foreign fighters remains strong.