Dexter Filkins in the New York Times Magazine:
Late in the afternoon of June 10, during a firefight with Taliban militants along the Afghan-Pakistani border, American soldiers called in airstrikes to beat back the attack. The firefight was taking place right on the border itself, known in military jargon as the “zero line.” Afghanistan was on one side, and the remote Pakistani region known as the Federally Administered Tribal Areas, or FATA, was on the other. The stretch of border was guarded by three Pakistani military posts.
The American bombers did the job, and then some. By the time the fighting ended, the Taliban militants had slipped away, the American unit was safe and 11 Pakistani border guards lay dead. The airstrikes on the Pakistani positions sparked a diplomatic row between the two allies: Pakistan called the incident “unprovoked and cowardly”; American officials regretted what they called a tragic mistake. But even after a joint inquiry by the United States, Pakistan and Afghanistan, it remained unclear why American soldiers had reached the point of calling in airstrikes on soldiers from Pakistan, a critical ally in the war in Afghanistan and the campaign against terrorism.
The mystery, at least part of it, was solved in July by four residents of Suran Dara, a Pakistani village a few hundred yards from the site of the fight…