Emergency responders responded at 8:12 p.m. to state Highway 12 between Summerset and Church roads after receiving a report of a traffic collision.
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One vehicle was a Honda Accord occupied by three people while the other was a Chevrolet Suburban occupied by seven people who were on vacation in the U.S. from Mexico, police said.
The Honda appears to have been traveling west on Highway 12 when it veered off the roadway to the right, overcorrected and then entered the eastbound lane, colliding with the Chevrolet head-on. The driver and the rear passenger of the Honda were ejected from the vehicle during the crash.
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Rio Vista police have not yet made a definitive driving under the influence (DUI) determination, but they report that there were "numerous" open alcoholic beverage containers in and around the Honda.
The Honda was being driven by a 20-year-old man out of Rancho Cordova. A 19-year-old passenger was the owner of the vehicle, a woman from Vacaville. The third occupant of the car was a similarly-aged "Jane Doe," police said. All three occupants of the car are now dead and their identities are being withheld pending notification of next-of-kin.
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A passenger in the Chevrolet has also died, Laura Poiret, who was in her early to mid 70s, according to police. Also in the Chevrolet were two girls, one 8 years old and one between 13 and 15. All of the passengers remain in hospitals in stable condition, police said.
The area was shut down for a period on Wednesday night as several agencies controlled the scene and investigated, including the Rio Vista Police Department, the California Highway Patrol, the Solano County Sheriff's Office, and medical teams.