The Libyan government said that 11 people were killed by NATO airstrikes Monday against civilian and military sites south of the capital Tripoli, a military source said, DPA reported.
Scores were injured by NATO attacks on Zlitan, Jafara and the Ein Kam valley areas, around 600 kilometres south of Tripoli.
He added that this is the second time NATO has conducted daytime strikes in the country.
NATO carried out its first daytime airstrikes in the current operation over Libya on Saturday, targeting a camp for forces loyal to leader Moamer Gaddafi.
NATO has launched more than 8,800 sorties in its air campaign, which began in late March after the UN Security Council passed a resolution ordering the protection of civilians in a conflict between Gaddafi's regime and rebels.
In a speech delivered in Bulgaria, NATO Secretary General Anders Fogh Rasmussen said the "Libya operation was a great success" in terms of NATO managing to act at an early stage of a conflict.
The rebels, who controls key eastern cities such as Benghazi, said the government has killed more than 12,000 civilians in more than three months of conflict.