UPDATE 5.30pm: Ambulance officers transported a fourth motocross rider from Gap Creek Farm to Warwick Hospital late this afternoon.

 The 21-year-old man had a dislocated shoulder and head injury. He had an altered level of consciousness on scene and arrived in the ambulance at the hospital at 4.10pm.

 He was the fourth rider injured in action at the motocross facility at Tregony for the day.

EARLIER: 2.19pm: THE Queensland Ambulance Service arrived at Gap Creek Farm for the third time today after a 12-year-old boy hit his head while riding.

The crew from Warwick responded to the third incident at Gap Creek Farm after a report at 1.20pm that a 12-year-old had hit his head in a fall. The boy was wearing a helmet. He was transported to Warwick Hospital

Earlier in the day, the QAS was called to Gap Creek Farm after a 22-year-old man suffered an ankle injury after falling off his bike just before 9.30am

Just after the ambulance left for the Warwick Hospital, QAS received a call that a 16-year-old boy riding at Gap Creek Farm had suffered a shoulder injury.

A spokeswoman for QAS said they were advised by the crew in the vehicle that the condition of the 22-year-old man with the fractured ankle was such they could return to the farm to assess with boy with the shoulder injury.

The ambulance crew then headed to Warwick Hospital with the two patients.

Earlier in the weekend, the QAS transported a 28-year-old driver with a fractured foot from Morgan Park Raceway to Warwick Hospital.

The QAS was called to the CAMS Queensland Motor Racing Championships at Morgan Park at 1.40pm Saturday.