Twelve car bombs have exploded across Iraq killing at least 60 people in predominantly Shia areas.

At least ten people were killed when two car bombs blew up near a bus station in the city of Kut, 150km southeast of the capital, police said.

Four more died in a blast in the town of Mahmoudiya, about 30km south of Baghdad.

Two people died in two bombings in Samawa further south.

The rest of the bombings took place across Baghdad, in Sadr city, Habibiya, Hurriya, Bayaa, Ur, Shurta, Kadhimiya and Risala neighborhoods.

A relentless campaign of bombings and shootings has killed nearly 4,000 people in Iraq since the start of the year.

The violence has raised fears of a return to full-blown conflict in a country where Kurds, Shia and Sunni Muslims have yet to find a stable way of sharing power.

In July alone, more than 810 people have lost their lives in militant attacks.

Sectarian tension across the region has been inflamed by the civil war in neighbouring Syria, which has drawn Shia and Sunnis from Iraq and beyond into battle on opposite sides.