(S (S (PP (IN In) (BASENP (NNP September))) (COMMA ,) (S (BASENP (NNP al-Shabab)) (VP (VBD claimed) (NP (BASENP (NN responsibility)) (PP (IN for) (NP (BASENP (DT a) (JJ bold) (NN attack)) (PP (IN on) (NP (BASENP (DT a) (NN meeting)) (PP (IN between) (NP (BASENP (NN government) (NNS officials)) (CC and) (NP (NP (NP (BASENP (DT the) (NNP African) (NNP Union) (JJ peacekeeping) (NN mission)) (PP (IN in) (BASENP (NNP Somalia)))) (PRN (COMMA ,) (VP (VBN known) (PP (IN as) (BASENP (NNP AMISOM)))) (COMMA ,))) (SBAR (WHNP (WDT which)) (S (VP (VBD killed) (NP (BASENP (NN 17) (NNS peacekeepers)) (COMMA ,) (PP (VBG including) (BASENP (DT the) (JJ top) (JJ Burundian) (NN commander)))))))))))))))))) (PERIOD .))