(S (S (S (BASENP (DT The) (NNS victims)) (VP (VBD had) (VP (VBN been) (VP (VBG trying) (S (VP (TO to) (VP (VB reach) (BASENP (DT a) (JJ free) (NN mosquito) (NN net) (NN handout))))))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT a) (NN stampede)) (VP (VBD erupted) (COMMA ,) (S (VP (VBG causing) (BASENP (DT the) (NN collapse)))))))) (PERIOD .))