(S (S (NP (BASENP (NNS Officials)) (PP (IN at) (NP (BASENP (DT the) (NNP Canadian) (NNP Security) (NNP Intelligence) (NNP Service)) (PRN (LRB -LRB-) (BASENP (NNP CSIS)) (RRB -RRB-))))) (VP (VBP are) (VP (VBG working) (PP (IN on) (S (VP (VBG identifying) (NP (BASENP (DT the) (NN man)) (SBAR (WHNP (WP who)) (S (VP (VP (VBD entered) (BASENP (NNP Canada))) (ADVP (BASENP (NNS years)) (RB ago)))))))))))) (PERIOD .))