Since the attacks of Sept. 11, 2001, violence perpetrated by non-state terrorist organizations has become an increasingly serious threat to global peace and security. This symposium will consider how international humanitarian law can respond to this development and evolve from its existing focus on interstate armed conflicts. Three panels will address (1) current and future issues concerning the detention and trial of suspected terrorists; (2) targeting and other uses of force against terrorist organizations and militants; and (3) comparative trends on these issues in key national jurisdictions.