Federal agents arrested a man Wednesday for plotting to bomb the Washington, D.C., subway system, the Justice Department announced. It was the second arrest in as many days involving Americans hoping to wage violence for al-Qaida or the Taliban, and federal law enforcement officials believe it is part of a wider attempt to launch terrorist attacks. Farooque Ahmed, 34, of Ashburn, Va., was indicted Wednesday for attempting to provide material support to a terrorist organization, collecting information to assist in planning a terrorist attack on a transit facility, and attempting to provide material support to help carry out multiple bombings...