More than 50 wounded were admitted to Sebha hospital, according to the hospital's management's Facebook statement.
A group of protesters said it would occupy city streets and squares until all the ruling political bodies "announce their resignation in public".
The announcement comes after Libyan Army's recent gains against militias of warlord Khalifa Haftar, which are supported by France, Russia, the United Arab Emirates, and Egypt.
At least nine soldiers were killed in an attack on a training camp belonging to the eastern Libyan armed forces of Khalifa Haftar in the city of Sebha.
At least nine soldiers and two civilians were killed in the gruesome attack carried out about 500 kilometres south of Tripoli.
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