Members of U.S. Homeland Security's Visible Intermodal Prevention and Response (VIPR) unit monitor a section of Penn Station on Thursday, Jan. 30, 2014, in New York. Federal and local authorities have studied intelligence about recent attacks on mass transit in Russia and heightened security for the Super Bowl, despite no specific terror threats. VIPR is part of a nationwide security program under the Transportation Security Administration (TSA). (AP Photo)
Featured Photo Galleries
