On March 4, the United States used drones and other aircraft to drop precision bombs on Somalia, a country with which we are not at war, reportedly killing about 150 al-Shabab militants who were said to be preparing for an imminent attack on American and African Union forces. The US government asserted that no civilians were killed, although neither that claim nor the allegation of an imminent attack could be verified. What do we really know about how American officials decide to launch such strikes?

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