The interim Libyan leader Mohammed Magarief has vowed to disband all illegal militias in the aftermath of the US ambassador's death this month.
He said all camps and militias not under the authority of the government would be dissolved and no unauthorised checkpoints allowed.
Militias that emerged during the fight to topple Col. Muammar Gaddafi last year remain a powerful force.
Residents of Benghazi evicted militants in response to the envoy's death.
Ambassador Christopher Stevens and three other Americans were killed during an attack on the city's US consulate on September 11, which coincided with protests over an anti-Islam video produced in the US.