Counterterrorism and Homeland Security

Led by the Warfare, Irregular Threats, and Terrorism Program, the International Security Program, Defending Democratic Institutions, and the Arleigh A. Burke Chair in Strategy, CSIS provides strategic thinking on the range of efforts to counter terrorist groups and their methods across the world.

Photo: Majid Saeedi/Getty Images

Photo: Majid Saeedi/Getty Images

Why Iran Will Escalate

Iran has limited options to respond to the killing of Hamas political leader Ismail Haniyeh, making escalation likely, even if Tehran prefers a return to the status quo.

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Commentary by Alexander Palmer — August 8, 2024

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Seth G. Jones

Seth G. Jones

Senior Vice President; Harold Brown Chair; and Director, International Security Program
Suzanne Spaulding

Suzanne Spaulding

Director, Defending Democratic Institutions, and Senior Adviser, Homeland Security, International Security Program
James Andrew Lewis

James Andrew Lewis

Senior Vice President; Pritzker Chair; and Director, Strategic Technologies Program
Daniel Byman

Daniel Byman

Senior Fellow, Warfare, Irregular Threats, and Terrorism Program
Catrina Doxsee

Catrina Doxsee

Fellow, Warfare, Irregular Threats, and Terrorism Program

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Why Iran Will Escalate

Iran has limited options to respond to the killing of Hamas political leader Ismail Haniyeh, making escalation likely, even if Tehran prefers a return to the status quo.

Commentary by Alexander Palmer — August 8, 2024

Ismail Haniyeh’s Assassination: Escalation or an Off-Ramp?

Ismail Haniyeh’s death represents a pivotal moment that could plunge the region into a broader and more destructive war or crack open the door for Netanyahu to claim victory against Hamas and eye a path to reduce Israeli military operations in Gaza.

Commentary by Riley McCabe — August 1, 2024

Assessing Israel’s Strike on Iran

In its April 19 attack on Iran, Israel avoided further escalation, while also threatening Iran's most sensitive locations. New CSIS analysis shows how it walked the tightrope.

Commentary by Alexander Palmer, Daniel Byman, Seth G. Jones, and Joseph S. Bermudez Jr. — May 3, 2024

How Might Israel Strike Back?

Israel has vowed to retaliate for Iran's drone and missile attack. The government needs to restore deterrence and satisfy its own population, but all its options have costs and risks.

Commentary by Daniel Byman — April 16, 2024

The Islamic State in Khorasan Province: Exploiting a Counterterrorism Gap

The attack on Crocus City Hall in Moscow in March 2024 demonstrates that not only is the Islamic State in Khorasan Province the Islamic State's most dangerous affiliate, but also that it has effectively exploited gaps in current international counterterrorism efforts.

Commentary by Tricia Bacon — April 11, 2024

Hamas’s October 7 Attack: Visualizing the Data

CSIS researchers present 10 figures and images to illustrate different dimensions of Hamas's October 7 attack, Israel's response, and the impact for Gaza and the world.

Commentary by Daniel Byman, Riley McCabe, Alexander Palmer, Catrina Doxsee, Mackenzie Holtz, and Delaney Duff — December 19, 2023

Chad: The Sahel’s Last Domino to Fall

Major cracks in Mahamat Déby's rule in Chad are emerging, which could ultimately spell Déby’s demise and usher in a new period of transition and violent instability for the country and the wider region.

Commentary by Cameron Hudson — December 6, 2023