Libyan rebel vehicles with mounted missile launchers park next to a road sign that reads, in Arabic, "Sirte," on the front line, 86 miles from Sirte, Libya, on Monday, Aug. 29, 2011. Rebels have been converging from the east and west on Sirte, 250 miles east of Tripoli, preparing to battle forces loyal to Col. Moammar Gadhafi, whose tribe is based in the city. (AP Photo/Gaia Anderson)

Photo by: Gaia Anderson

Libyan rebel vehicles with mounted missile launchers park next to a road sign that reads, in Arabic, "Sirte," on the front line, 86 miles from Sirte, Libya, on Monday, Aug. 29, 2011. Rebels have been converging from the east and west on Sirte, 250 miles east of Tripoli, preparing to battle forces loyal to Col. Moammar Gadhafi, whose tribe is based in the city. (AP Photo/Gaia Anderson)