Hundreds of people had gathered in the centre of the eastern city to protest against a power-sharing agreement proposed by UN envoy Bernardino Leon.
At least five people were killed and 30 wounded on Friday in Benghazi when rockets hit protesters who gathered in Libya's second city to demonstrate against a UN-proposed peace deal, medics said.
Hundreds of people had gathered in the centre of the eastern city to protest against a power-sharing agreement proposed by UN envoy Bernardino Leon.
"The exact toll could be much higher, as medics are still trying to collect human remains from the site," one source said.