Libya: covert guerrilla war in Tripoli
A covert guerrilla war, waged by underground rebel cells and fought mainly at night, is increasingly challenging the Gaddafi regime's hold over Tripoli.
Residents of the Libyan capital have spoken of an upsurge in drive-by shootings, attacks on security checkpoints and frequent gun-battles once darkness has fallen over the city.
Even as it fights opposition forces on...