At least five people were killed and 30 wounded 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.