(S (S (S (S (BASENP (NNS Police)) (VP (VBP believe) (S (NP (BASENP (DT the) (NN use)) (PP (IN of) (BASENP (NNS timers)))) (ADJP (ADJP (RBR more) (JJ likely)) (PP (IN than) (BASENP (NN suicide) (NNS bombings))))))) (SBAR (IN as) (S (BASENP (DT the) (NNS blasts)) (VP (VBD were) (VP (ADVP (RB so) (RB closely)) (VBN timed)))))) (CONJP (COMMA ,) (CC but)) (S (VP (VP (VBP are) (RB not)) (VP (VP (VBG ruling) (PRT (RP out))) (BASENP (NN anything)))))) (PERIOD .))