A pilotless U.S. drone aircraft fired a missile in northwest Pakistan on Saturday, killing 13 people including some foreign militants, security officials and residents said. The attack was in the North Waziristan region, a stronghold of al Qaeda and Taliban militants on the Afghan border, in an area 35 km (20 miles) west of the region's main town of Miranshah at about 3 a.m. (6 p.m. EDT on Friday), they said. "The missile hit a house where some guests were staying," one intelligence agency official said, referring to foreign militants. "We have information that 13 people were killed including some...