Libya's military police chief, Colonel Mustapha al-Barghathi, has been shot dead in the eastern city of Benghazi in the latest assault on the restive country's fledgling security forces.
Unknown assailants gunned down Barghathi outside his home, Colonel Abdullah al-Zaidi, spokesman for the security services, told AFP.
He said Barghathi - a former rebel leader in the 2011 uprising that toppled longtime dictator Moamer Kadhafi - died of head and chest wounds at the Mediterranean city's Al-Jala hospital.
Barghathi was the first officer in Kadhafi's army to defect and form a rebel force in the revolt, Zaidi said.
Later on Friday, members of the slain officer's Braghtha tribe fired rocket-propelled grenades at the home of another prominent former rebel they believed was behind the killing, according to a security source. The home was empty at the time.
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The house belonged to Wissam Ben Hamid, commander of the Shield of Libya brigade, made up of Islamist former rebels.
The group's headquarters were attacked in June by protesters seeking to drive militias out of the eastern city, sparking clashes in which more than 30 people were killed.
Benghazi was the cradle of the uprising that toppled Kadhafi's regime, but has since seen a series of assassinations targeting officers in the security services.
Two years after the revolution, Libya's new authorities have failed to establish a new army and police force, and are still struggling to rein in tribal militias and groups of former rebels.
