Rasa - At least three vehicles of the convoy were reportedly destroyed or damaged in the attack which occurred at 10 pm (local time) on Saturday.
Some media reports say the convoy has been targeted by a remote-controlled VBIED.
The convoy was reportedly traveling between the cities of Diwaniyah in Al-Qadisiyyah province and Svehiclein Muthanna province.
The videos and images released of the incident suggest that the vehicles caught fire following the attack.
It is not immediately clear if any casualties were incurred.
The newly formed Iraqi group, Saraya Thawrat al-Eshreen al-Thaniya, has claimed responsibility for the attack.
Anti-US sentiments have been running high in Iraq since Washington assassinated top Iranian commander Qassem Soleimani and the second-in-command of the Iraqi popular mobilization units, Abu Mahdi al-Muhandis, in January.
Following the attack, Iraqi lawmakers unanimously approved a bill on January 5, demanding the withdrawal of all foreign troops.
Baghdad and Washington are currently in talks over the withdrawal of American troops.
Iraqi resistance groups have vowed to take up arms against US forces if Washington fails to comply with the parliamentary order.