(S (S (BASENP (NNS Authorities)) (VP (VBP say) (SBAR (S (NP (BASENP (DT the) (NN investigation)) (PP (IN into) (SBAR (WHADVP (WRB how)) (S (BASENP (PRP it)) (VP (VBD started)))))) (VP (MD may) (VP (VP (VP (VB take) (PRT (RP up))) (PP (TO to) (BASENP (NN three) (NNS days)))) (S (VP (TO to) (VP (VB finish)))))))))) (PERIOD .))