(S (S (BASENP (NNS Authorities)) (VP (VBP believe) (SBAR (IN that) (S (S (NP (BASENP (DT all) (NN 180) (NNS people)) (ADJP (JJ onboard) (BASENP (DT the) (NN plane)))) (VP (VBP have) (VP (VBN died)))) (CONJP (COMMA ,) (CC and)) (S (NP (BASENP (DT a) (JJ further) (NN 15) (NNS people)) (PP (IN on) (BASENP (DT the) (NN ground)))) (VP (VBP are) (VP (VP (VBN feared) (ADJP (JJ dead))) (ADVP (RB as) (RB well))))))))) (PERIOD .))