A Libyan security personnel was shot dead outside his home in the Mediterranean Sea city of Benghazi on Thursday, a medical source told MENA.The incident occurred after some unidentified militants opened their fire at the security element.Libya is facing turmoil as the government of Prime Minister Ali Zeidan is struggling to control armed militias who helped overthrow former president Muammar Gaddafi in 2011 and have retained their weapons to make financial and political demands.