Libyan leader Col. Muammar Gaddafi remains on the run as rebel troops continue to encircle the loyalist, desert holdout of Bani Walid. A convoy of fighters with the rebels’ National Transitional Council arrived at the besieged town late Wednesday night. Rebel leaders have speculated Gaddafi’s sons, and perhaps Gaddafi himself, are holed up in Bani Walid. Communications have been cut off inside, and aid agencies have raised concerns about humanitarian conditions. The rebels have also sent troops to the border of Niger, which a pro-Gaddafi convoy crossed earlier this week. In a defiant audio message released earlier today, Gaddafi said he remains in Libya and urged supporters to continue fighting rebel forces.