ORINDA -- A suspect in a hit-and-run crash was shot by a California Highway Patrol officer Friday afternoon, but details of what led to the shooting were still unclear Friday evening as investigators worked the scene.

According to Contra Costa County Sheriff's spokesman Jimmy Lee, a CHP officer was investigating an injury hit-and-run collision when he spotted a car that matched the description of the suspect vehicle parked along the shoulder on Wilder Road, just off the offramp from eastbound Highway 24, around 4 p.m.

The officer pulled up behind the car and parked, Lee said.

"At some point during the contact, the officer discharged his firearm at the male driver, striking him in the torso," Lee said in a statement.

Lee did not say what led the officer to open fire on the driver.

The suspect was taken to John Muir Medical Center but his condition was not immediately available Friday evening, according to Battalion Chief Sean Perkins of the Moraga-Orinda Fire District. Perkins said the man was awake and alert when he was taken away by paramedics.

There were no reports of other injuries.

The shooting occurred as the Friday afternoon commute got underway, causing heavy traffic. The offramp remained closed to traffic Friday evening.

A motorcycle crashed and caught on fire on the Oakland side of the tunnel about half an hour before the shooting, forcing the closure of three lanes of eastbound Highway 24. Officials would not say if that crash was at all related to the shooting.

California Highway Patrol officers and deputies from the Sheriff's office were on the scene interviewing witnesses Friday evening. Officers from the Orinda, Lafayette and East Bay Regional Parks police departments also initially responded to the call.

As of 8 p.m., investigators were still canvassing the scene for evidence, including extensively examining the suspect car, a silver Honda sedan.

An joint investigation by the California Highway Patrol, the Contra Costa County Sheriff's Office and the Contra Costa County District Attorney's Office is ongoing. Anyone with any information on this incident should call the Office of the Sheriff at 925-646-2441.

Contact Katie Nelson at knelson@bayareanewsgroup.com and follow her at Twitter.com/katienelson210. Contact Kristin J. Bender at kbender@bayareanewsgroup.com and follow her at Twitter.com/kjbender.