(S (S (S (BASENP (NNP UN) (NNS personnel)) (VP (VBD had) (S (VP (TO to) (VP (VB be) (VP (VP (VBN left) (ADVP (RB behind))) (PP (IN after) (BASENP (DT the) (NN blast))))))))) (CC but) (S (BASENP (DT no) (NNP UN) (NNS staff)) (VP (VBD were) (VP (VBN injured))))) (PERIOD .))