A driver followed a group of alleged carjackers after witnessing them in the act early Wednesday in Lawrence. The witness told police he was in his vehicle at a stoplight at 79th Street and Sunnyside Road about 3 a.m. when a car pulled up behind another car and ran into its bumper. When the driver got out, two men stuck a gun in her face and took the car. The witness followed the two cars and called police, who tracked the vehicles to a neighborhood near 56th Street and Arlington Road. Officers arrested Sonny Jones, who is on parole for dealing cocaine and aggravated battery, and Jeremy Wiley, who has previous convictions for burglary. Police are seeking at least one other suspect.