BEND, Ore. (AP) — Oregon authorities are investigating an explosion inside a World War II-era tank that left two people dead.

The blast occurred Tuesday afternoon at a public gun range east of Bend. Paramedics tried to save the victims but they died from their injuries. No names have been released. Deschutes County Sheriff Shane Nelson tells KTVZ-TV that rescuers were able to speak with one of the victims before death.

There was no word on what caused the explosion, but Nelson says video was being shot around when the blast occurred that could help them learn more about what happened.

The station showed footage of the tank in a field. Authorities said there is no risk to the public. Detectives from the sheriff's office and the Oregon State Police Arson and Explosives Section are investigating.