(S (S (S (BASENP (NNS Authorities)) (VP (VBP report) (NP (NP (BASENP (DT the) (NN loss)) (PP (IN of) (BASENP (NN two) (JJ human) (NNS lives)))) (PP (JJ due) (PP (TO to) (BASENP (DT this) (NN incident))))))) (COMMA ,) (S (BASENP (DT the) (NN cause)) (VP (VP (VBZ has) (RB not)) (VP (ADVP (RB yet)) (VP (VBN been) (VP (VBN revealed))))))) (PERIOD .))