San Diego, CA A fire engine on scene of an accident on 163, was rear-ended by another vehicle around 2 AM early Sunday morning. The fire engine was stopped behind a crashed vehicle. While attending to the victims a small red Nissan collided with the parked unit causing injuries to all occupants. Additional apparatus and rescue crews including the CHP responded to the scene causing the northbound lanes of the freeway to be completely shut down while the roadway was cleared. None of the fire fighters were injured during the incident.