(S (S (ADVP (RB Specifically)) (COMMA ,) (S (BASENP (NNS Police)) (VP (VBP are) (VP (VBG trying) (S (VP (TO to) (VP (VB determine) (SBAR (IN if) (S (NP (BASENP (DT any) (JJ other) (NNS participants)) (PP (IN in) (BASENP (DT the) (NN fight)))) (VP (VBD were) (VP (VBN armed)))))))))))) (PERIOD .))