Speed was a factor in the crash, the Los Angeles County Sheriff's Office said.The wreck took place about 3:30 p.m. (6:30 p.m. ET), about 300 yards from the office park where the event was held. The speed limit there is 45 mph.Up and down the road near the crash site were burned rubber and doughnut marks as though someone smoked their tires in figure 8 patterns."I don't know if the marks in the road are related to the crash," said Los Angeles County sheriff's Sgt. Brian Allen.Deputies arrived at the scene to find a vehicle on fire, he saidOnce fire crews put the flames out, they found two occupants, both of whom were pronounced dead at the scene.