No known threat of Brussels-type attack in U.S.: Homeland Security chief

WASHINGTON (Reuters) - U.S. Secretary of Homeland Security Jeh Johnson said on Tuesday that the United States has no intelligence that indicates there is a plot to carry out an attack inside U.S. borders similar to the one in Brussels "At present, we have no specific, credible threat of any plot to conduct similar attacks here in the United States," Johnson said in a statement. Johnson added that the Transportation Security Administration is ramping up security in major city airports and rail and transit stations throughout the United States. (Reporting by Julia Edwards; Editing by Leslie Adler)