BAGHDAD — Firebrand Shiite Muslim cleric Muqtada al-Sadr announced Wednesday that he's temporarily suspending the activities of his feared Mahdi Army militia so that the organization can be restructured.

The announcement, a day after Mahdi Army members were accused of inciting clashes in Karbala that killed at least 52 people, seemed to be a startling admission that the militia, which twice fought brutal uprisings against U.S. troops and has been blamed for thousands of death-squad killings, was no longer under Sadr's control.

American officials in Baghdad and Washington greeted word of the suspension cautiously, calling it an encouraging sign but saying it would take time to determine the impact of Sadr's announcement.

Meanwhile, a U.S. military spokesman in Baghdad said higher-level officers had ordered the detentions Tuesday of eight Iranian officials who were in Iraq to meet with officials of the Ministry of Electricity.

The spokesman, Lt. Col. Christopher Garver, didn't say who issued the order but said it came after American troops had allowed the Iranians and their Iraqi security guards to pass through a checkpoint and proceed to the Sheraton Ishtar Hotel in central Baghdad. Garver said the U.S. soldiers had confiscated an AK-47 that the Iraqis were carrying.

After the Iranians left the checkpoint, other officers ordered American troops to follow them to the hotel, Garver said. There, the soldiers searched the Iranians' rooms, detained them and led them blindfolded from the hotel for questioning. U.S. soldiers confiscated a laptop computer, cell phones and a briefcase full of Iranian and American currency, Garver said.

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The Iranians were released Wednesday after Iraqi Prime Minister Nouri al-Maliki complained. It was unclear whether the confiscated items had been returned.

The arrests were the latest in a series of U.S. actions against Iranian officials in Iraq on official business. The U.S. is still holding, over Iraqi objections, five Iranians who were detained last year after American officials accused them of plotting attacks against Iraqi and U.S. forces.

If the Mahdi Army stands down, that could ease what American officials have said is their greatest long-term worry about Iraq's stability: a prolonged conflict between the Mahdi Army and a rival Shiite militia for control of Shiite areas.

Sadr said the Mahdi Army would suspend operations for up to six months while it was restructured, but many Iraqis wondered whether militia members would obey his directive. Witnesses to Tuesday's clashes in Karbala said Mahdi Army fighters openly defied calls from a top Sadr official who was trying to calm the conflict.

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