Six people were killed and three others critically injured during air strikes targeting an Iraqi militia convoy north of Baghdad, Reuters reported on Saturday, citing an Iraqi army source.

Two of the three vehicles making up a militia convoy were found burned, the source said, as well as six burned corpses.

The identity of those killed was not immediately known. 

Meanwhile, Iraqi Popular Mobilization Forces said on Saturday that the strike hit a convoy of medics, not senior leaders as reported in some media.

"Initial sources confirm that the strike targeted a convoy of Popular Mobilization Forces medics near Taji stadium in Baghdad," it said in a statement.

The development came one day after U.S. airstrike killed Qasem Soleimani, commander of Iran's Islamic Revolution Guards Corps (IRGC) Quds Force, sparking heightened tension across the Middle East and raising fears among Iraqis.

Read more: Top Iran commander Qasem Soleimani killed in U.S. strike on Baghdad