They told Iran's Fars News Agency that the staff of the Sadr Movement was arrested and all computers in the headquarters building were confiscated by the soldiers.
Followers of Shiite Iraqi cleric Moqtada Sadr are among the main opponents of extending the U.S. military mission in Iraq.
Late last month Iraqi Prime Minister Nouri al-Maliki announced that Baghdad will not accept an extended U.S. military mission in his country.
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