Two big rigs and two passenger vehicles collided and spilled diesel fuel across a Florida highway Thursday, sparking a massive fire that killed seven people, authorities said. The wreck happened on Interstate 75 about a mile (1.6 kilometers) south of Alachua, near Gainesville. The flames were fed by about 50 gallons (189 liters) of diesel, authorities said. Up to eight others were taken to the hospital, some with critical injuries, the Gainesville Sun reported. Authorities initially said six had died but late Thursday night revealed a seventh victim had perished.