(S (S (BASENP (PRP He)) (VP (VP (VBD linked) (BASENP (PRP them))) (PP (TO to) (NP (NP (NP (BASENP (DT an) (NN explosion)) (PP (IN on) (BASENP (DT the) (NN 31st)))) (PP (IN in) (BASENP (DT a) (NNP Moscow) (NN hotel)))) (COMMA ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (S (BASENP (DT a) (NN bomber)) (VP (VBD died))) (SBAR (IN after) (S (NP (BASENP (DT the) (NN device)) (SBAR (S (BASENP (PRP he)) (VP (VBD was) (VP (VBG building)))))) (VP (VP (VBD went) (PRT (RP off))) (ADVP (RB prematurely))))))))))) (PERIOD .))