OMAHA, Neb. (AP) — A high school football player remains in a medically induced coma after an injury in Friday night’s game.

The Omaha World-Herald reports Papillion-La Vista football player Brandon Steburg was taken to the hospital by ambulance Friday after collapsing on the sidelines.

Steburg’s grandfather, Steve Sheridan, said the cause of Steburg’s injury is somewhat of a mystery.

Steberg had made a tackle and told his coach that someone landed on his head awkwardly. Then he lost consciousness.

School district spokeswoman Annette Eyman says Steburg appeared to have a concussion and had surgery Friday night to relieve pressure on his brain.