Assume that the United States has identified a terrorist group located in a town in Pakistan, and has reliable information that the group will strike against a major U.S. city within 48 hours. The U.S. believes that if it quickly strikes the group's headquarters it can prevent the attack; the U.S. believes that it can carry out a drone strike from a U.S. carrier in the Indian Ocean, but civilians will be killed.

List the legal issues and questions that this problem raises.