(S (S (BASENP (DT The) (NNP PSNI)) (COMMA ,) (VP (VBP believe) (SBAR (IN that) (S (BASENP (DT the) (NN officer)) (VP (VBD was) (VP (VBN hit) (PP (IN by) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (NN two) (NNS shots)) (VP (VBN fired) (PP (IN by) (NP (BASENP (DT a) (NN gunman)) (VP (VBN secreted) (PP (IN in) (NP (BASENP (NNS scrubland)) (PP (IN on) (BASENP (DT the) (NN estate))))))))))))))))))) (PERIOD .))