(S (S (PP (IN In) (NP (BASENP (NN response)) (PP (TO to) (BASENP (DT the) (NN threat))))) (COMMA ,) (S (BASENP (JJ several) (NNS teams)) (VP (VBP are) (VP (VBN scheduled) (S (VP (TO to) (VP (VP (VP (VP (VB sweep) (BASENP (DT some) (NNS stadiums))) (PP (IN with) (BASENP (NN radiation) (NN detection) (NNS devices)))) (PP (IN on) (BASENP (NNP Sunday)))) (PP (IN for) (NP (BASENP (DT the) (NN presence)) (PP (IN of) (BASENP (JJ radioactive) (NNS materials)))))))))))) (PERIOD .))