(Reuters) - Members of a Libyan army unit said they had defected and "liberated" the country's second city from forces loyal to veteran leader Muammar Gaddafi after scores of protesters were killed in the bloodiest revolt now shaking the Arab world. Two residents of Benghazi told Reuters on Sunday that members of the army's "Thunderbolt" squad had switched sides after days of violence that mark the most serious challenge to Gaddafi's 42-year rule. Al Jazeera reported clashes in the capital between thousands of protesters and Gaddafi supporters. In the port city of Benghazi, two residents said members of the army's Thunderbolt squad had arrived at the local hospital with soldiers wounded in clashes with Gaddafi's personal guard. "They are now saying that they have overpowered the Praetorian Guard and that they have joined the people's revolt," lawyer Mohamed Al-Mana said by telephone. It was not possible to independently verify the information. http://uk.reuters.com/article/2011/02/20/uk-protests-idUKTRE71F2SE20110220 The "thunderbolt" unit of the Libyan army has defected and defeated Ghadaffi's Praetorian guard.