MODESTO (CBS13) — Officers say a possible street race preceded a crash on Highway 99 that left an uninvolved pregnant driver with major injuries over the weekend.

California Highway Patrol’s Modesto division says a four-vehicle crash happened near Crows Landing Road just before 4 p.m. Investigators believe two sedans were possibly racing each other when one caused a multi-vehicle crash.

READ MORE: 'Prime Suspect' Paul Flores Arrested In 1996 Disappearance Of Kristin Smart; Still No Remains Found

The crash sent an SUV off the freeway and left the driver, a pregnant woman, with major injuries, but her unborn child was unharmed, CHP confirmed.

READ MORE: Sacramento Hires Inspector General To Independently Review Police Use Of Force Cases

Officers confirmed two young children that were also in the SUV were largely unharmed. Both were taken to hospitals as a precaution. CHP could not confirm how the two children are related to the woman who was driving.

Officers say the sedan that caused the crash became disabled and the driver, identified as 25-year-old Shaw Conklin, got stuck at the scene. The other driver suspected of racing continued up the freeway.

MORE NEWS: Lack Of Healthy Players Cuts Davis High School Football Season Short

Anyone who may have seen the crash or what led up to is now being urged to call CHP at (209) 545-7450.