The SUV hit the pedestrians yesterday as they were leaving the East Sarang Community Church in Chino, near Los Angeles.
Police say the driver was trying to exit his parking spot when he reversed too forcefully, hopping a curb and plowing in the group. They say he then drove across the parking lot and crashed into the side of a building.
Two women were pronounced dead at the scene. Police have not released their names. Four other people were taken to a hospital. Their injuries are not believed to be life-threatening.
The investigation is ongoing.