Iraq has said today's conference in Baghdad was "constructive and positive".
Iraqi foreign minister Hoshiyar Zebari said the meeting of regional countries and world powers in Baghdad had achieved good results, including setting up committees on security, refugees and fuel and power.
"The meeting was constructive and positive in fact in its atmosphere and the composition," Mr Zebari told a news conference after the meeting.
Hoshiyar Zebari, Iraq foreign minister
Iraq called the mid-level meeting to enlist support to end violence four years after the US invasion but it was also a rare opportunity for officials from Washington and Tehran to meet at a time of growing tension over Iran's nuclear ambitions.
Opening the conference today, Iraq's prime minister urged regional rivals to stop using his country as a battleground to fight their differences.
Nuri al- Maliki told the conference that Iraq had become a "frontline battlefield" and he said all those with a stake in the peace of the Middle East should stand firm against terrorism in Iraq.
"[Iraq] needs support in this battle that not only threatens Iraq but will spill over to all countries in the region," he said.
"We call on all to take moral responsibility by adopting a strong and clear stance against terrorism in Iraq and cooperate in stamping out forces of terror," Mr Maliki said in a written version of his speech to the opening session of the conference.
Mr Maliki told the conference that national reconciliation was crucial to saving his country and urged key players not to use Iraq to play out their differences.
He also called on officials from regional and world powers to pursue dialogue to settle disputes over Iraq.
Mr Maliki urged help in stopping financial support, weapons pipelines and "religious cover" for the relentless attacks of car bombings, killings and other attacks that have pitted Iraq's Sunnis against majority Shiites.
He expressed hope the conference could be a "turning point in supporting the government in facing this huge danger".
The one-day gathering is seen as a prime opportunity for some icebreaking overtures between Iran and the United States, whose chief delegate has left open the door for possible one-to-one exchanges about Iraq.
It brings together Iraq's six neighbours, the five permanent UN Security Council members and several Arab representatives. Its primary goal is to pave the way for a high-level meeting possibly next month.
But the meeting also gives a forum to air a wide range of views and concerns including US accusations of weapons smuggling from Iran and Arab demands for greater political power for Iraq's Sunnis.
The US ambassador to Iraq said he talked directly to Iranian delegates as well as in a group setting during the conference.
Asked if he had direct talks with Iranians, Zalmay Khalilzad told a news conference: "I did talk to them directly and in the presence of others. We engaged across the table as well."
Meanwhile, a suicide car bomber blew himself up at an Iraqi army checkpoint on the outskirts of a Shi'ite district of the Iraq capital, killing six soldiers and wounding 20 civilians, the US military said.
Earlier Iraqi police had put the death toll from the car bomb at between six and 10, with up to 43 people wounded in the blast on the edge of Sadr City, a Shi'ite militia stronghold in northeast Baghdad.
Sadr City is the Baghdad stronghold of the Mehdi Army, a Shi'ite militia loyal to radical young cleric Moqtada al-Sadr. US and Iraqi forces last week pushed into the district as part of a major security crackdown throughout Baghdad.
Millions of Shi'ites were also converging on the southern city of Kerbala today for the climax of the religious rite of Arbain today. Such events have been targeted by insurgents before and security was tight there too.
Agencies