"Six people were killed and 15 others wounded after an explosives-laden vehicle was detonated in the central city square," an Iraqi interior ministry source told The New Arab media outlet late on Saturday.
The area has been cordoned off by security forces in an effort to prevent a recurring attack, according to the website.
No terrorist group, including the Islamic State (Daesh) has so far taken responsibility for the bombing.
Daesh has previously taken responsibility for a number of attacks in the Iraqi capital, often targeting Shiites. In late November, the group took responsibility for a truck bomb which killed some 100 Shiite pilgrims south of the city.
Daesh overran large parts of Iraq in 2014 amid the ongoing civil war in neighboring Syria. Iraqi forces have since pushed back and are now fighting to liberate the northern city of Mosul from the militants.
