The Shiite militia run by anti-American cleric Muqtada al-Sadr seized control of the southern Iraqi city of Amarah today in one of the boldest acts of defiance yet by the country’s powerful, unofficial armies, witnesses and police said.

The Shiite militia run by anti-American cleric Muqtada al-Sadr seized control of the southern Iraqi city of Amarah today in one of the boldest acts of defiance yet by the country’s powerful, unofficial armies.