(S (S (BASENP (JJ Pakistani) (NNS officials)) (VP (VBP have) (VP (VBN stated) (SBAR (IN that) (S (BASENP (NN three) (NNP US) (NN drone) (NNS strikes)) (VP (VBP have) (VP (VP (VP (VBN killed) (BASENP (NN fifteen) (NNS people))) (PP (IN in) (BASENP (DT the) (NN country)))) (BASENP (NNP Saturday))))))))) (PERIOD .))