(S (S (S (BASENP (NN Two) (NN police) (NNS officers)) (VP (VBD were) (VP (VBN injured)))) (COMMA ,) (FRAG (FRAG (BASENP (NN one)) (SBAR (WHADVP (WRB when)) (S (VP (VBN hit) (PP (IN by) (BASENP (DT an) (NN iron) (NN bar))))))) (CC and) (FRAG (BASENP (NN another)) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP he)) (VP (VBD was) (VP (VBN hit) (PP (IN with) (BASENP (DT a) (NN dart)))))))))) (PERIOD .))