The bloodshed, which has left around 200 people dead in the past week alone, has forced Baghdad to appeal for international help to combat militancy just months ahead of its first general election in four years.
Officials have also voiced concern over a resurgent Al-Qaeda emboldened by the civil war in neighbouring Syria which has provided the jihadist network's front groups in Iraq with increased room to plan operations.
In the restive northern city of Mosul, gunmen shot dead Alaa Edwar, a Christian journalist working for Nineveh al-Ghad, a local television network backed by provincial Governor Atheel al-Nujaifi.
His murder came after attacks last month in Mosul killed three journalists and badly wounded a fourth.
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The predominantly Sunni Arab city is one of the most dangerous areas in Iraq, with militants frequently carrying out attacks and also reportedly extorting money from shopkeepers.
Iraq has come in for repeated criticism over shortcomings in media freedom, and ranks first in the Committee to Protect Journalists' Impunity Index, which tracks unsolved murders of journalists.
Nineveh province, of which Mosul is the capital, saw the lion's share of today's attacks.
In southern Baghdad, meanwhile, gunmen killed a restaurant owner, and a gun attack targeting an army checkpoint in Balad north of the capital killed a soldier.
The government and security forces have insisted that raids and operations across much of western and northern Iraq, areas dominated by the country's Sunni minority, are having an impact.