A man described by federal authorities as an assistant to a top Hamas operative was arrested by Maryland Transportation Authority police after he was seen videotaping the Chesapeake Bay Bridge, authorities said Tuesday. Ismael Selim Elbarasse of Annandale, Va., suspected by federal authorities of having financial ties to the Palestinian terrorist group Hamas, was arrested Friday after two off-duty Baltimore County police officers saw him taping the bridge from a sport utility vehicle, said Marcia Murphy, a spokeswoman for the U.S. attorney's office in Baltimore. Elbarasse was not charged with a crime but was detained on a material witness warrant...