NEW : Teen killed when at least three bombs explode outside music festival . Four killed after suspected Pakistan missile strike fired from drone , official says . Marchers protest recent U.S. missile strikes on the Pakistani tribal areas . Attack believed to be fourth in U.S. since early November . NATO bombing leaves at least three people dead in northwest .
NEW : Teen killed when at least three bombs explode outside music festival . Four killed after suspected Pakistan missile strike fired from drone , official says . Attack believed to be fourth in U.S. since early November . NATO bombing leaves at least three people dead in northwest .