The bomb was set off on Friday near the northern entrance to the city, revered by Shiite Muslims. It reportedly triggered a fire and a blast in the gas-powered vehicle.
A suspect thought to have planted the bomb has been detained, according to al-Sumaria television channel.
Iraqi security forces continue to root out militants after announcing Daesh defeat in 2017.
*Daesh (ISIL/ISIS/Islamic State/IS), a terrorist group banned in Russia and a wide number of other countries.