Man with al-Sadr ties held in attack on U.S. troops

http://www.cnn.com/2007/WORLD/meast/03/22/iraq.main/index.html
"A man with ties to a radical Shiite cleric is in U.S. custody in connection with an attack that killed five American soldiers in Karbala in January, U.S. officials said....Qais Khazali was known as a spokesman for Shiite cleric Muqtada al-Sadr's political movement in 2004 in Baghdad's Sadr City, but it is not clear whether he is still involved with al-Sadr's movement."

The shiite militia that he is said to be associated with, Al-Sadr's Mehdi army, is responsible for a lot of the distress caused to the efforts in Iraq today. They are said to have close ties to the sectarian violence. This article touches on some of the attacks that they believe this group to be responsible for.