An improvised explosive device (IED) is a bomb constructed and deployed in ways other than through conventional military action. IEDs generally combine four elements: a power source, an initiator (such as a blasting cap), an explosive charge (commercial, military, or homemade, including ammonium nitrate–based mixtures), and a switch or trigger (command wire, radio control, victim-operated pressure plate, or timer). They may be emplaced on roadsides, carried by suicide bombers (SVBIEDs and PBIEDs), or delivered by vehicle (VBIEDs).
IEDs became the signature weapon of the post-2001 conflicts in Iraq and Afghanistan, where they caused a majority of coalition combat casualties and prompted the U.S. Department of Defense to establish the Joint IED Defeat Organization (JIEDDO) in 2006, later renamed the Joint Improvised-Threat Defeat Organization. The MRAP (Mine-Resistant Ambush Protected) vehicle program was a direct procurement response. Groups including the Taliban, al-Qaeda in Iraq, ISIS, Boko Haram, the FARC, and various Sahelian armed groups have made extensive use of IEDs.
Internationally, IEDs intersect with several legal and policy frameworks. The Convention on Certain Conventional Weapons (CCW) Amended Protocol II (1996) regulates mines, booby-traps, and "other devices," which encompasses many victim-operated IEDs. The UN General Assembly has adopted recurring resolutions on "countering the threat posed by improvised explosive devices," and UNMAS (the UN Mine Action Service) coordinates IED clearance in mission contexts such as Mali and Iraq. Controls on precursor chemicals—particularly ammonium nitrate fertilizer and urea nitrate—are a major prevention pillar, as are restrictions on detonators and dual-use electronics.
Counter-IED doctrine typically organizes around three lines of effort: attack the network (targeting financiers, bomb-makers, and supply chains), defeat the device (detection, jamming, EOD disposal, armored vehicles), and train the force. Civilian harm remains substantial: Action on Armed Violence and the ICRC have repeatedly documented that IEDs in populated areas disproportionately kill civilians.
Example
In the August 2021 Kabul airport attack during the U.S. withdrawal from Afghanistan, an ISIS-K suicide bomber detonated a person-borne IED at Abbey Gate, killing 13 U.S. service members and roughly 170 Afghan civilians.
Frequently asked questions
Yes. Victim-activated IEDs functioning as mines or booby-traps fall under CCW Amended Protocol II (1996), and all IED use is constrained by IHL principles of distinction, proportionality, and precaution.
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