(S (S (NP (BASENP (DT A) (NN team)) (PP (IN of) (NP (BASENP (NNS investigators)) (VP (VBN led) (PP (IN by) (NP (NP (BASENP (DT the) (JJ deputy) (NN prosecutor)) (PP (IN of) (BASENP (DT the) (NNP Maritime) (NNP Territory)))) (PRN (COMMA ,) (BASENP (NNP Sergei) (NNP Luchaninov)) (COMMA ,)))))))) (VP (VBZ is) (VP (VBG looking) (PP (IN into) (SBAR (WHADVP (WRB how)) (S (BASENP (DT the) (NN fire)) (VP (VBD started)))))))) (PERIOD .))