(S (S (S (S (BASENP (NN Four) (JJ young) (NNS girls)) (VP (VBD were) (VP (VBN killed)))) (CC and) (S (BASENP (QP (NN six) (JJR more)) (NNS people)) (VP (VBN injured)))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT a) (NN brick) (NN wall)) (VP (VP (VBD collapsed) (PP (IN on) (NP (BASENP (NN top)) (PP (IN of) (BASENP (PRP them)))))) (PP (IN in) (BASENP (NNP Zambia))))))) (PERIOD .))