(S (S (NP (BASENP (DT The) (JJ Italian) (NNS dailies)) (NP (BASENP (NNP La) (NNP Repubblica)) (CC and) (BASENP (NNP Corriere) (NNP della) (NNP Sera)))) (VP (VBP are) (VP (VBG reporting) (SBAR (IN that) (S (BASENP (NNP US) (NNS forces)) (VP (VP (MD may) (RB not)) (VP (VB have) (VP (VBN been) (VP (VBN informed) (PP (IN of) (NP (NP (BASENP (DT the) (NN operation)) (SBAR (S (VP (TO to) (VP (VB rescue) (NP (NP (VBN kidnapped) (BASENP (JJ Italian) (NN journalist))) (PRN (COMMA ,) (BASENP (NNP Giuliana) (NNP Sgrena)) (COMMA ,)))))))) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (BASENP (DT the) (NN intelligence) (NN agent) (NNP Nicola) (NNP Calipari)) (VP (VBD was) (VP (VBN killed) (PP (IN by) (BASENP (NNP US) (NNS troops)))))))))))))))))) (PERIOD .))