Officials have identified the four people killed, including an infant and child, in a fiery San Joaquin County crash.A minivan crash in San Joaquin County on Saturday night killed a baby, another child, a man and a woman and sent three children to the hospital with major injuries, according to the California Highway Patrol. The county medical examiner identified those killed as 4-month-old David Negrete Guerrero, 12-year-old Jorge Negrete Guerrero, 40-year-old Liliana Guerrero Mendoza and 44-year-old Arriaga Bonifacio Negrete. All four resided in Livermore.A group of people rushed to the scene to help rescue the children who survived. CHP said the crash happened around 10:07 p.m. on State Route 120, west of Highway 99 near Manteca. A Toyota minivan with seven people inside, including five children, was traveling around 60 to 65 mph on the wet roadway when the driver lost control for unknown reasons and hit the center median.After hitting the median, the minivan entered the grass median separating eastbound and westbound State Route 120 and eventually became airborne, CHP said. The minivan struck the overpass on Van Ryn Avenue, overturned and caught fire, according to CHP. Gina and Joe Rosamond stopped at the scene, thinking it was a grass fire. But they quickly learned people were in trouble."We saw 15-to-20 people assisting, pushing the car up from its side to try to get its back on its wheels," said Gina Rosamond. She said they were doing this while the van was on fire. CHP said the good Samaritans saved three children."The car was on fire and multiple people began pulling the children out," said Sgt. Andra Stockwell. "It was a dangerous situation they put themselves in, in a heroic manner."Stockwell said paramedics took a 14-year-old girl, a 9-year-old boy and a 7-year-old girl to area hospitals. It is unknown whether the driver was under the influence of drugs or alcohol.