German federal prosecutors said Friday they have arrested a man suspected of helping a terrorist cell that allegedly plotted attacks against U.S. troops in Germany. The U.S. military's Ramstein Air Base is believed to have been one of the targets for plotters. The prosecutor's office identified the man only as "Kadir T.," and said he is a German of Turkish origin. He is suspected of acquiring a video camera and night-vision equipment for the Islamic Jihad Union group, prosecutors said. The items were allegedly shipped to Waziristan in Pakistan, prosecutors said. Four men trained by the Islamic Jihad Union are...