(S (S (BASENP (NNP Homeland) (NNP Security) (NNP Secretary) (NNP Janet) (NNP Napolitano)) (VP (VP (VP (VBD announced) (BASENP (NN today))) (PP (IN at) (BASENP (DT a) (NN news) (NN conference)))) (SBAR (IN that) (S (BASENP (DT the) (NNP U.S.)) (VP (VBZ has) (VP (VP (VBN declared) (BASENP (DT a) (JJ public) (NN health) (NN emergency))) (PP (IN in) (NP (BASENP (NN light)) (PP (IN of) (BASENP (DT the) (JJ swine) (NN flu) (NN outbreak))))))))))) (PERIOD .))