Some were believed to be the remnants of the Khamis Brigades, which were controlled by Muammar Gaddafi's son Khamis until he was apparently killed in a rebel ambush nine days ago. "There was a surprise movement this afternoon," Tripoli's rebel military commander, Abdul Hakim Belhaj, said. "The Gaddafi brigades appear to have abandoned their checkpoints. "The radio station is under the control of t