Which type of IED is primarily rigged in a structure intended to detonate upon the arrival of friendly forces?

The type of improvised explosive device (IED) that is primarily rigged in a structure to detonate upon the arrival of friendly forces is a House Borne IED (HBIED). These devices are typically hidden within a location such as a building or other structure, designed to target unsuspecting groups, particularly military or law enforcement personnel, as they enter the vicinity.

The functioning of an HBIED relies on the element of surprise and the timing of the detonation, which is often set to trigger when a specific anticipated event occurs, such as the arrival of a convoy or personnel. This strategic placement aims to maximize casualties and damage when the intended targets are most vulnerable.

In contrast, command detonated IEDs require the operator to actively trigger the explosion, and vehicle borne IEDs (VBIEDs) inherently involve vehicles as the delivery method rather than being stationary. Suicide vests are worn by individuals and detonated manually, but they do not specifically focus on the arrival of forces in the same manner as HBIEDs.