Libya's rebels...

....were in disarray on Friday after the mysterious killing of their leading military commander triggered fears that opposition fighters battling to oust Col Muammar Gaddafi could instead turn their weapons on each other.

Units loyal to Gen Abdel Fattah Younes, who was shot dead on Thursday, reportedly abandoned the rebel front line near the oil town of Brega and poured into the opposition capital of Benghazi to avenge their commander's death.