(S (S (BASENP (JJ Unconfirmed) (NNS reports)) (VP (ADVP (RB also)) (VP (VBP claim) (SBAR (SBAR (S (BASENP (DT the) (NNP Federal) (NNP Security) (NNP Service)) (VP (VBD was) (VP (VP (VBG searching) (PP (IN for) (BASENP (NN three) (NNS people)))) (ADVP (RB ahead) (PP (IN of) (BASENP (DT the) (NN attack)))))))) (CC and) (SBAR (IN that) (S (BASENP (DT the) (NN bomber)) (VP (VBD was) (NP (BASENP (NNP Vitaly) (NNP Razdobudko)) (PP (IN of) (BASENP (NNP Stavropol))))))))))) (PERIOD .))