A Libyan mourner fires shots in the air at a cemetery on August 12 during the funeral of five rebels killed in the battle for the control of the oil-rich town of Brega. Tripoli, Libya (CNN) -- Rebels said Saturday that they were gaining traction in a series of offensives in several parts of Libya controlled by ruler Moammar Gadhafi -- claims that the Libyan government swiftly disputed. Heavy gunfire was heard in al-Zawiya, located about 33 miles west of Tripoli, where rebels had arrived. Rebels entered the city center and managed to cut off the road to Tripoli, they...