The US is pretty sure that an American missile killed Osama bin Laden's son in Pakistan, reports NPR. Spy agencies are "80 to 85%" certain that a missile from a US drone killed Saad bin Laden, thought to be in his late 20s, sometime in the last year. Saad bin Laden was active in al-Qaeda but not a major figure. "We make a big deal out of him because of his last name," says a counterterrorism official. (More Saad bin Laden stories.)