A three-car accident in Brentwood on Monday afternoon resulted in two drivers being airlifted to a trauma center for treatment of their injuries.

The accident, which was reported at 3:09 p.m., occurred on Vasco Road approximately one mile south of the intersection with Walnut Boulevard.

There are few details available regarding the cause of accident which is under investigation by the California Highway Patrol (CHP). What is known is that the driver of a silver Audi A4 was struck broadside by a black Toyota Corolla. The driver of the Audi was transported by a CalStar helicopter to the trauma center at the John Muir Medical Center in Walnut Creek with major injuries and what East Contra Costa Fire Protection District (ECCFPD) Battalion Chief Craig Auzenne described as “massive trauma”.

The driver of the Toyota was initially up and walking after the accident, but shortly thereafter began to suffer from his injuries. People who stopped to assist immediately after the accident loaded him into the bed of a passerby’s pickup truck. Upon their arrival, firefighters and paramedics treated him there before transporting him to a CHP helicopter. He was also flown to the John Muir Medical Center with a broken wrist, shortness of breath and chest pains among other possible injuries.

The driver of the third vehicle was treated by paramedics on scene and released. His vehicle, a gray Nissan Versa, suffered front-end damage, though it’s not clear how that damage occurred.

Each vehicle involved was occupied only by the driver.

Vasco Road was closed between Walnut Boulevard and Camino Diablo while rescue operations were underway and both helicopters landed on the roadway.

In addition to the helicopters, ECCFPD Engines 52 and 59 responded to the incident along with two battalion chiefs, two AMR ambulances and several CHP officers. Operations continued for nearly 90 minutes.