(S (S (BASENP (NNS Police)) (VP (VBP say) (SBAR (S (BASENP (PRP they)) (VP (VBD recovered) (NP (NP (NP (NP (BASENP (NN 11) (ADJP (RB previously) (VBN stolen)) (NNS motorcycles)) (COMMA ,) (BASENP (DT a) (NN grenade))) (COMMA ,) (BASENP (DT a) (NN fusil))) (COMMA ,) (BASENP (DT a) (NN walkie-talkie))) (CC and) (NP (BASENP (NNS fireworks)) (PRN (LRB -LRB-) (S (BASENP (DT the) (NNS criminals)) (VP (ADVP (RB usually)) (VP (VP (VBP use) (BASENP (NNS fireworks))) (S (VP (TO to) (VP (VP (VB warn) (BASENP (NNS fellows))) (PP (IN about) (NP (BASENP (DT the) (NN arrival)) (PP (IN of) (BASENP (NNS police))))))))))) (RRB -RRB-))))))))) (PERIOD .))