(S (S (NP (BASENP (DT Another) (NN security) (NN official)) (PRN (COMMA ,) (BASENP (NNP Khabib) (NNP Khan)) (COMMA ,))) (VP (VBD said) (SBAR (IN that) (S (S (NP (EX there)) (VP (VBD were) (NP (BASENP (QP (RB around) (NN three) (NN hundred)) (NNS people)) (VP (VBG attending) (PP (IN at) (BASENP (DT the) (NN volleyball) (NN competition))))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN explosion)) (VP (VBD happened)))))))) (PERIOD .))