KANSAS CITY, Kan. — The 10-year-old boy killed during a ride on the world’s tallest waterslide was decapitated in the accident, a person familiar with the investigation said Wednesday.

The person, who spoke on condition of anonymity because the person was not authorized to speak publicly, gave no other details of how Caleb Schwab died Sunday on the raft ride at the Schlitterbahn WaterPark in Kansas City, Kansas. Authorities have yet to explain how it happened.

Two women who are not family members were in the raft at the time with the boy and were treated for facial injuries. The boy’s parents – Republican state Rep. Scott Schwab and his wife, Michele – have requested privacy and have not spoken publicly since the death. The boy’s funeral is scheduled for Friday.

A spokeswoman for the waterpark on Wednesday declined to discuss the circumstances of the boy’s death on the ride called “Verruckt” – or German for “insane.”

Verruckt featured multi-person rafts that make a 168-foot drop at speeds of up to 70 mph.