Iraqi security forces are reported to be massing in southern Iraq in preparation for a major operation to drive out Shia militia groups.
Iraqi Prime Minister Nouri Maliki had set a deadline of midnight local time for militia groups around the city of Amara to lay down their weapons.
Some 60 militants have already surrendered, police say.
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Iraqi prime minister meets officials in Tehran ...
Turkish warplanes strike Kurdish rebels in Iraq ... Moqtada Sadr, have abandoned their local office, reports say.
A similar offensive in Basra last March led to weeks of fierce fighting in which hundreds were killed.
It is hoped that this latest move against the militias will succeed without any serious challenge, says a BBC correspondent in Baghdad.
Security compromises
Meanwhile, Iraqi Foreign Minister Hoshyar Zebari has said he is optimistic that a security agreement with the US will be reached by the end of July.
"There is more flexibility on the US side to reach an agreement that is more acceptable, reasonable both for us and for them too," said Mr Zebari.
A state department spokesman confirmed that the negotiations were making progress and that compromises were being made on both sides.
Last week, Mr Maliki had said negotiations were deadlocked.
The pacts have been at the centre of much debate, both in Iraq and the US.
The optimism seems to stem from a US willingness to show flexibility in the talks, says the BBC's US State Department correspondent, Kim Ghattas.
Our correspondent says sticking points in the negotiations had been:
- the number of bases the US would retain in Iraq after a UN mandate for foreign troops in Iraq expires on 31 December
- whether US troops will still have the power to detain Iraqis and conduct operations independent of Iraqi control
- whether US contractors would have immunity from prosecution in Iraq
(BBC)
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