(S (S (BASENP (DT The) (NNP UN)) (VP (VBZ has) (VP (ADVP (RB reportedly)) (VP (VBN stated) (SBAR (IN that) (S (NP (BASENP (NN none)) (PP (IN of) (BASENP (PRPD their) (NNS observers)))) (VP (VBD were) (VP (VBN injured))))))))) (PERIOD .))