A hundred people have so far been killed and more than 400 others injured in clashes that started two weeks ago between Libyan military troops and "Fajr Libya" militants in the city of Kakla, west of the capital Tripoli.
Gharian Hospital has sent medical supplies to a field hospital in the city, a medical source said on Saturday.
A source with Fajr Libya, meanwhile, told Al-Tadamon news agency that militants took control over the areas of Abu Shaiba, Raas al-Lafaa, al-Rabata, al-Kasarat, Baer al-Ghanam and Wadi al-Haye.
Fajr Libya is bracing for a battle to liberate all of Kakla city, the source said, adding that militants will do so within hours.