A Libyan official quit his job on Wednesday highlighting tensions in the security establishment after a deadly attack killed four Americans, including the ambassador, in Benghazi.
"There are problems at the ministry of interior and disputes between the security services," Fawzi Wanis al-Kadhafi, head of the supreme security committee in Benghazi, told AFP.
"Working conditions are not the same as before, so I decided to resign," he added.
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The supreme security committee, which falls under the interior ministry, was established by ex-rebels after the overthrow of Moamer Kadhafi last year in a bid to restore order.
Libya's interior minister on Monday announced the sacking of deputy interior minister for the eastern region, Wanis al-Sharef, and the head of national security for Benghazi, Hussein Bou Hmid.
The resignation comes a week after Ambassador Chris Stevens and three other Americans were killed as the Benghazi consulate came under fire from rocket-propelled grenades.
The attack was orginally blamed on protesters angered by an anti-Islam film made in America but neither US or Libyan officials have excluded the possibility that it was a pre-planned attacked supported by Al-Qaeda.