Activists in the rebel-controlled city of Misurata, the sole remaining opposition stronghold in the country's western half, claimed that at least 13 soldiers of an elite brigade run by Kadafi's son Khamis had defected to the rebels. The men are now being grilled for information about Kadafi's forces, said Salah Abdelaziz, an architect in Misurata who serves as a spokesman for the opposition.