在英国的恐怖袭击事件之后，美国国土安全部部长迈克尔·切多夫在接受几家媒体采访时表示将加强反恐安全管理
Homeland Security Secretary Michael Chertoff made appearances on several television talk shows. He told ABC's This Week program there is no indication of a linkage between the events in Britain and any specific attacks on the United States. "We do not have, at this point, specific, [wv]cred…