Gunmen attacked an Iranian oil delegation visiting Baghdad on Wednesday, the Iranian Oil Ministry said.
"The delegation was attacked by terrorists but they are not harmed and have no problems," the ministry's Shana website said.
"The delegation was visiting Iraq to hold talks about exporting fuel to Iraq. They came under gunfire when heading to the Electricity Ministry building."
An Iraqi Interior Ministry source said the convoy was attacked in central Baghdad and two Iraqi guards were wounded.
The head of the Iranian delegation said a contract was signed between the two neighboring countries.
"We signed a contract to export 1.5 million liters of fuel to Iraq," said Alireza Zeyghami, the semi-official Fars news agency reported, without giving further details.
Another Iraqi government source said it was an Iranian technical team visiting Baghdad as part of meetings to discuss border demarcation and investment in joint oilfields.
Iran did not say who was behind the attack and no group has taken responsibility for the attack yet.
Iranian pilgrims to Iraq (of which there have been millions) have come under terrorist attack in the past. That an oil delegation has now come under attack is not quite so surprising given the internal dynamics at work in the country since the U.S. military occupation took effect in 2003.