SANTA CRUZ, Calif. -- Staff at the Santa Cruz Beach Boardwalk continue to work with state investigators to find the cause of an accident on the Cyclone ride that injured a nine-year-old boy and his mother Monday.

Investigators with Cal-OSHA were out on the scene at 8 a.m. Tuesday morning, inspecting the ride. The accident happened around 4:40 p.m. Monday when the gate to the cyclone ride detached. It hit the cage where 9-year-old Sebastian Plamieri of Martinez was standing. His mother Gabriella Lindheimer was there.

"I was yelling for people to stop the ride. I was the only adult on the ride and they [the children] started freaking out," remembered Lindheimer. "Some of them started to pullout the strap, so I started yelling at them to stay where they were."

She says her son was scared and in shock. He received first aid at the scene. Lindheimer was also injured and had neck and back pain.

Boardwalk spokesperson Kris Reyes was unsure how the accident took place.

"It somehow impacted one of the stalls that the riders stand in. The wall of the stall is what caused the injury to the child. The wall sort of buckled," Reyes said. "It's something that we'll be looking at over the next few days to make sure it doesn't happen again."

The ride was shut down immediately and evacuated. It remains closed for the foreseeable future.

Two nearby rides, the Convoy and the Tornado, were temporarily shut down shortly after the Cyclone was halted. Both have since been reopened.

Tuesday, a Cal-OSHA spokeswoman said that the cyclone ride has no history of trouble and it had passed inspection by state investigators at least three times this year: in January, February, and most recently on July 10th.

Boardwalk staff members say they are continuing to do their regular daily inspections of all rides and they will do everything they can to find out what caused the gate to detach from the ride.

CAL-OSHA has a total of 6 months to complete their investigation into this accident.