Federal agents on Thursday detained a Washington County lawyer in connection with the deadly March 11 terrorist attack in Madrid -- the first American connection to the worst terrorist attack since Sept. 11, 2001.Brandon Mayfield, 37, who lives in Aloha and played a minor legal role in the Portland Seven terrorism case, was picked up at his West Slope law office on a material witness hold Thursday morning, said Tom Nelson, Mayfield's attorney. < snip >