Graphic: The battle for Libya
Rebels tighten grip on Libya as western cities fall
Muammar Gaddafi was struggling to hold on to power in Libya on Thursday as rebels extended their territory by seizing important towns close to the capital
Tribal system holds balance of power in Libya
Powerful military elites ultimately decided the outcome of Egypt and Tunisia’s revolutions, but in Libya the much more opaque and complex tribal power structures could decide how events play out.