Good afternoon. Im mike mibach. A San Francisco High School Student killed. His mother and sister injured after they were involved in a horrific collision at gough and pine. Tara moriarty joins us live from pine and gough where several blocks are still shut down. Reporter well, witnesses including two Police Officers say that an elderly woman who was driving at speeds up to 80 miles an hour before she crashed into a white catering van and the gold colored minivan that you see, killing a teenager. The major accident Investigators Team is still reconstructing how all of this unfolded so tragically. Two twisted heaps of metal live in gough and pine streets. The witnesses say it sounded like an explosion. The van was airborne. Reporter tanya smith says it was scary. When i looked up, the car was landing. Reporter just before 7 00, officers spotted a silver mercedes speeding westbound on pine. The car was going so fast, they didnt have time to activate lights an sirens to get within a block