The Turkish consul to the northern city of Mosul and a top criminal judge in executed dictator Saddam Hussein's hometown were also caught in bomb attacks.
The violence was the latest in a surge of unrest that has killed more than 3,800 people since the start of the year and sparked widespread concern Iraq is slipping 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.
Interior ministry spokesman Brigadier General Saad Maan said two suicide bombers blew themselves up outside Hardan's home at around 3:00 pm (1200 GMT), killing five of his guards and wounding four others.
A security source said the suicide bombers were given cover by gunmen who opened fire on the house, and fled the scene after the attack. A medical source confirmed the toll.
Hardan was not at home at the time of the attack, according to Maan.
As a result, however, Sunni militants view them as traitors and frequently target them in attacks.
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 the northern city of Mosul, according to diplomatic sources who said that while no one was wounded, all of the convoy's vehicles were badly damaged.
"The investigation is continuing. We have contacted the Iraqi authorities immediately after the incident and asked that the culprits be found out and that the security of our missions be enhanced.
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