At least 31 people were killed and more than 235 others injured Friday when gunmen opened fire on a group of protesters demonstrating against the presence of armed militia in Tripoli, state media reported.
The clash marked the deadliest outbreak of violence in Libya's capital since the 2011 revolution that ousted Muammar Gaddafi.
"The demonstration was peaceful and had been permitted by the Interior Ministry, and then the protesters were fired on when they entered [the militia's district]," Prime Minister Ali Zeidan said in a TV interview Friday.
"The existence of weapons outside the army and police is dangerous," Zeidan said. "All armed militias need to leave Tripoli, without exception."
The number of injured and dead is expected to rise overnight.