Yes, they were local boats taking part in SCYC Keelboat race week. I understand that 5 hit the rock. The bell buoy was replaced a few years ago by a lit red buoy located in the same position as the bell buoy which was some distance to the east. I thought a East Cardinal was more suitable (but would probably not prevented this particular accident). Apparently the course involved rounding the red to starboard and then sailing round East Tudwal to starboard also. This puts the rocks directly on the race line!
It was a serious accident, there were several minor injuries on some of the boats but one of the injured later required the air ambulance for travel to hospital. At least 3 of the boats had to be lifted out for inspection.