(S (S (S (NP (NP (BASENP (NNS Witnesses)) (PP (IN near) (BASENP (DT the) (NN scene)))) (CC and) (BASENP (NNS police))) (VP (VBP say) (SBAR (IN that) (S (S (NP (QP (ADVP (IN at) (JJS least)) (NN 2)) (NNPS Apaches)) (VP (VBD were) (VP (VBG flying) (ADVP (RB together))))) (SBAR (WHADVP (WRB when)) (S (BASENP (NNS insurgents)) (VP (VBD began) (S (VP (TO to) (VP (VP (VB shoot) (PP (IN at) (BASENP (DT the) (NNS choppers)))) (COMMA ,) (S (VP (VP (VP (VBG shooting) (NP (BASENP (NN one)) (PP (IN of) (BASENP (PRP them))))) (PRT (RP down))) (CC and) (VP (VBG hitting) (BASENP (DT the) (JJ other))))))))))))))) (CONJP (COMMA ,) (CC but)) (S (BASENP (DT the) (NN helicopter)) (VP (ADVP (RB still)) (VP (VBD managed) (S (VP (TO to) (VP (VB fly) (ADVP (RB away))))))))) (PERIOD .))