Hundreds of protesters clashed with police and pro-government demonstrators in the Libyan city of Benghazi on Wednesday. Dozens of people were hurt when unrest erupted overnight after a government critic, Fathi Terbil who represents the relatives of more than 1,000 prisoners who were allegedly massacred in Tripoli’s Abu Salim jail in 1996, was arrested. The violence comes a day before planned anti-government demonstrations, organized via social networks, were to take place. Protestors threw stones and petrol bombs, and police responded with rubber bullets and water canons. Colonel Muammar Gaddafi has ruled Libya since 1969, making him the longest-serving leader in the Arab world.