The Turkish consul to the northern city of Mosul and a top criminal judge in executed dictator Saddam Hussein's home town were also caught in bomb attacks.
The violence was the latest in a surge of unrest that has killed more than 3,800 people this year and sparked widespread concern that Iraq is slipping back towards the all-out bloodshed which plagued it in 2006 and 2007.
Authorities have pushed a massive security campaign targeting militants, but analysts and diplomats have cautioned that the government must also address the root causes of the violence.
Officials said two suicide bombers blew themselves up outside Hardan's home at around 3:00 pm (1730 IST), followed by a car bomb that went off as emergency responders arrived.
In all, eight people were killed and 14 were wounded, including Hardan himself.
The militia chief was taken to a hospital inside Baghdad's heavily fortified Green Zone, home to the US and British embassies and parliament.
Another attack on a Sahwa checkpoint -- this time a suicide car bomb -- on the outskirts of the restive city of Baquba, north of Baghdad, killed four people and wounded 10.
As a result, however, Sunni militants view them as traitors and frequently target them.
The government has increasingly turned to Sahwa fighters as it combats a surge in unrest, with violence at its highest level since 2008.
Also today, a bomb attack hit the convoy of the Turkish consul in Mosul, according to diplomatic sources who said that while no one was wounded, all of the convoy's vehicles were badly damaged.
"It's not yet clear who carried out the attack and against whom," a Turkish foreign ministry spokesman said, adding that Foreign Minister Ahmet Davutoglu had called the consul for more details.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
