(S (S (ADVP (RB However)) (COMMA ,) (S (PP (VBG according) (PP (TO to) (BASENP (JJ foreign) (NNS sources)))) (COMMA ,) (S (NP (BASENP (DT the) (NN five)) (VP (VBN killed))) (VP (VBD were) (NP (BASENP (NNS contractors)) (PP (IN for) (BASENP (DT the) (NNP Army)))))))) (PERIOD .))