A second blast killed at least 11 people in Pakistan 's volatile tribal , an official says . The blast comes as the U.S. is putting pressure on Pakistan to root out insurgents . The U.S. says militant groups are holding training camps in the region .
A bomb blast wounds at least 11 people in Pakistan 's volatile tribal , an official says . The blast comes as the U.S. is putting pressure on Pakistan to root out insurgents . The U.S. says terror groups are running training camps in the region .