(S (S (NP (NP (BASENP (DT The) (NN attack)) (PP (IN on) (BASENP (NNS civilians)))) (PP (IN by) (BASENP (DT the) (JJ Syrian) (NN military)))) (VP (VBD was) (VP (VBN reported) (PP (IN by) (NP (BASENP (DT the) (NNP Syrian) (NNP Observatory)) (PP (IN for) (BASENP (NNP Human) (NNPS Rights)))))))) (PERIOD .))