FEDS INVESTIGATE PLOT TO ATTACK D.C. METRO: “The investigation is focused on a naturalized U.S. citizen, originally from Pakistan, who became the target of an undercover sting operation, the sources said. An administration official said the man drew the attention of law enforcement officials by seeking to obtain unspecified materials. . . . Federal officials stressed that the public was never in danger. . . . The arrest is the latest in a series of cases involving U.S. citizens, including another Pakistani American who was convicted of planning to set off a car bomb in Times Square, that have raised concerns about an increasing number of Americans drawn to violent jihad.”