TRIPOLI: A Libyan militia leader whose detention sparked clashes that killed 55 people in the capital Tripoli this week has been released, a military official said on Thursday. Gun battles had raged on the streets of Tripoli from Monday night through Tuesday after 444 Brigade leader Mahmoud Hamza was apprehended by the rival Al Radaa Force. Hamza “was released on Wednesday night and returned to his headquarters south of Tripoli”, an official at army headquarters in western Libya said. The African Union on Thursday voiced “great concern”, calling for an immediate end to hostilities and for the pursuit of reconciliation efforts. “The situation is stable, with police patrols having been deployed” in the areas that had seen fighting, allowing people to move around, the military official said.