(S (S (BASENP (NN 38) (NNS people)) (VP (VBD were) (VP (VBN killed) (PP (IN on) (NP (BASENP (NNP Saturday)) (SBAR (WHADVP (WRB when)) (S (BASENP (DT a) (NNP US) (NNP Chinook) (NN helicopter)) (VP (VP (VBD crashed) (NP (BASENP (NN west)) (PP (IN of) (NP (BASENP (NNP Kabul)) (COMMA ,) (BASENP (NNP Afghanistan)))))) (COMMA ,) (PP (IN with) (S (BASENP (DT the) (NNP Taliban)) (VP (VBG claiming) (NP (BASENP (NN responsibility)) (PP (IN for) (BASENP (DT the) (NN crash))))))))))))))) (PERIOD .))