BAGHDAD - A prominent Iraqi Sunni tribal leader and his son were killed late on Friday in an attack on their convoy in south Baghdad, raising questions about security in the capital and threatening to exacerbate sectarian tensions.
Security and political sources said Sheikh Qassem al-Janabi and his son, Mohammad, were shot dead along with at least six guards after gunmen stopped them on the way back from their home in Latifiya, a city south of Baghdad.
The sheikh's nephew, parliamentarian Zayed al-Janabi, was also detained but later released, the sources said.
Interior ministry spokesman Brigadier-General Saad Maan told state television the ministry would investigate the incident.
No group has claimed responsibility for the attack, but Deputy Prime Minister Saleh Mutlaq called for curbs on Shi'ite armed groups, which operate freely in many areas and have spearheaded the battle against Islamic State insurgents after the army nearly collapsed last summer.