Happened in the T3/T4/B-Spec split start, around Turn 4 (I guess it would be?). Wherever the pedestrian walk over bridge is. From the camera that's posted down at the hairpin, you could look back down the track and watch all the clean up. Eventually a B-Spec Mini with most its front end wiped off get hauled away on a flatbed, followed by a T4 (?) Solstice that had been seriously messed up on all sides of it.
Then towards the end of the race, right in front of the same camera, looked like Larry Boylin getting shoved off the track into the guardrail at a high rate of speed, as he was on the outside of like four cars all trying to go side-by-side into the hairpin. That's why it ended under caution.
In other news, I love having cameras set up around the track at Majors races!