The shootout erupted in the early hours between armed men from the local tribe in the al-Zarga area in northern Najaf, some 160 km south of Baghdad, a local police officer told Xinhua on condition of anonymity.

A joint force from the Interior Ministry's emergency response division and Najaf provincial police arrested 53 gunmen from both sides of the shootout and seized weapons and ammunition, the Interior Ministry said in a statement.

It added that search operations are ongoing to locate additional gunmen and weapons, with more details to be released later.