(S (S (BASENP (NNS Reports)) (VP (VBP say) (SBAR (IN that) (S (BASENP (NNS flares) (CC and) (NNS helicopters)) (VP (MD could) (VP (VB be) (VP (VBN seen) (S (VP (VBG coming) (PP (PP (IN from) (CC and) (IN into)) (BASENP (DT the) (NN zone)))))))))))) (PERIOD .))