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FRESNO, Calif. (raw footage) More than 100 cars and trucks crashed on a fog-shrouded freeway Saturday, killing at least 2 people and injuring dozens more. 18 big rigs were involved in the massive pileup on Highway 99 just south of Fresno as patches of dense fog obscured visibility on the heavily traveled roadway. A 6-year-old boy and a 28-year-old man traveling in separate vehicles were killed in the chain-reaction collisions around 7:45 a.m. There was probably 2-foot visibility in the fog . Cars were backed up on top of each other. Rescuers had to extract several people from the wreckage, and paramedics took more than three dozen patients to the hospital with injuries. "Everybody was trying to miss everybody, but it was impossible not to get hit," said Cindy Ramirez, 21, of Selma, whose purple Mazda pickup truck was rear-ended. "I'm fine physically, but I keep thinking about all of the things that could have happened." Hours after the accident, the freeway was littered with smashed cars and trucks, broken glass, auto parts and blood. A big rig carrying stacked crates of live turkeys was stranded on the normally busy highway. Thick seasonal fog known as "Tule fog" typically occurs in Central California in the late fall and winter. A stretch of the highway several miles south was the scene of an autumn 74-car pileup nearly a decade ago that left two people dead.