Fort Hood, Texas (CNN) – Investigators believe the suspected gunman in last week's massacre at Fort Hood acted alone, but his communications had been flagged by U.S. intelligence agencies in late 2008, the FBI said Monday. [cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/11/10/hood.sign.art.jpg caption="Army Spc. Ryan Hill and daughter, Emma, 3, light a candle Saturday near the main gate … Continue reading Missed clues sought in Ft. Hood inquiry