IRAQ'S biggest Shia party today predicted a breakthrough on the country's constitution within the next two days, as negotiators scrambled to finish the draft by next week's deadline.

Meanwhile, a roadside bomb killed four more US soldiers in a city north of Baghdad.

Four days before the deadline, Sunni Arab members of the drafting committee met with Prime Minister Ibrahim al-Jaafari yesterday to present their objections to federalism and other issues blocking an agreement.

No statement was issued after the meeting, but Haitham al-Husseini, a spokesman for the Supreme Council for the Islamic Revolution in Iraq, said he expected a breakthrough within 48 hours.