NEW : Teen killed when three bombs exploded outside a festival . One killed after suspected U.S. missile strike fired from drone , official statement . Attack believed to be fourth in Pakistan since early November . It is also not known why the house was targeted . Mosque bombing leaves at least five people dead in northwest .
NEW : Teen killed when three bombs exploded outside a festival . One killed after suspected U.S. missile strike fired from drone , official statement . Attack believed to be fourth in Pakistan since early November . Mosque bombing leaves at least five people dead in northwest .