Libyan Prime Minister Ali Zidan blamed the protesters and the militia alike for the violence, though witnesses said they saw no protesters carrying weapons ahead of the shooting Friday afternoon.
By yesterday night, however, some protesters joined by other militias had armed themselves and heavy gunfire rang out in the Tripoli neighborhood where the attack happened.
Armed groups set up checkpoints across the Libyan capital, hoping to stop other militias from entering the city. Ambulance sirens wailed into the night.
The protesters marched from a downtown mosque to a neighborhood called Gharghour, home to the headquarters of a militia originally from the city of Misrata that has a powerful presence in Tripoli. Many militias have turned villas and residential compounds of former Gadhafi-era officials into camps where they stash weapons
When they neared the building, militiamen in civilian clothes and military uniforms came out of the headquarters, opening fire. Protesters ran from gunfire while carrying others covered in blood.
Libyan state television put the death toll yesterday, at 31, with 235 people wounded.
