(S (S (BASENP (NNS Questions)) (VP (VBP have) (VP (ADVP (RB also)) (VP (VBN been) (VP (VBN raised) (PP (IN as) (PP (TO to) (SBAR (SBAR (WHADVP (WRB why)) (S (BASENP (NNP BP)) (VP (VBZ has) (VP (VBN chosen) (S (VP (TO to) (VP (VB release) (BASENP (PRPD their) (NN report))))))))) (SBAR (IN before) (S (BASENP (NNS authorities)) (VP (VBP examine) (BASENP (DT the) (NN blowout) (NN preventer))))))))))))) (PERIOD .))