A senior US general says elite Iranian troops are operating in central Iraq and training Shi'ite militants to attack US and Iraqi forces.
Major General Rick Lynch said Sunday that intelligence reports indicate about 50 members of the (Quds force of the) Iranian Revolutionary Guards Corps have been crossing the border to train militants in using mortars and rockets.
Iran's Foreign Ministry denied the allegation.
The United States has previously accused the Revolutionary Guards of training militants in Iran and providing explosives used against US troops.
In violence Sunday in Iraq, a mortar attack killed 12 people in a Shi'ite neighborhood (Ubaidi) in eastern Baghdad.
In other news, Iraqi television reports that political leaders have agreed on an agenda for a summit aimed at reviving Iraq's unity government.
Iraqi Prime Minister Nouri al-Maliki called on the leaders of Iraq's main Sunni, Shi'ite and Kurdish groups to attend the summit. A date has not been announced.
Iraq's Sunni Vice President, Tareq al-Hashemi, took part in preparatory talks Saturday with other Iraqi leaders. But a spokesman says he was not persuaded to return his Iraqi Accordance Front party to the government.
The Iraqi Accordance Front is the largest Sunni bloc in Iraq's parliament. Its withdrawal from Mr. Maliki's cabinet earlier this month further weakened his unity coalition.