An accident this morning in San Andreas left four people injured. It happened at about 9:30 this morning at the intersection of Highway 12 and Highway 49. A big rig and another vehicle collided, severely injuring two people and moderately injuring two others. Three ambulances and two helicopters were called to the scene to transport the accident victims to Modesto hospitals. Details on how the wreck happened and the conditions of the injured have not been released.