(S (S (PP (VBG According) (PP (TO to) (NP (DT an) (NP (JJ anonymous) (BASENP (JJ Western) (NN military) (NN official)))))) (S (BASENP (PRP they)) (VP (VBD were) (VP (VBN injured) (PP (IN by) (BASENP (JJ friendly) (NN fire))))))) (PERIOD .))