WINSLOW (WGME) -- An 8-year-old boy is recovering in the hospital after suffering a serious head injury in a zipline accident.
Investigators from the State Fire Marshal's Office were back at Camp Caribou Thursday, inspecting equipment and questioning people about the zipline accident.
They say an 8-year-old boy from New York City, along with several other boys, were using the zipline Tuesday evening to enter the water from an initial height of about 50 feet.
The zipline is on the east side of Camp Caribou.
The boys start off in the woods and end up splashing into the water below.
A state fire investigator says the 8-year-old boy stayed on the zipline the whole way down, but then hit a boat as he hit the water.
"The child went up onto the zipline,” Chief Shawn O’Leary said. “Got onto it. Went down the line. And at the same time there was a recovery boat or a boat that was going through where the zipline was. The boy hit the boat."
Winslow police say the 8-year-old boy was flown by Life Flight to the Barbara Bush Children's Hospital with a serious head injury.
"He is at Maine Medical Center, at the Barbara Bush (Children's Hospital),” O’Leary said. “So it is very serious."
Investigators say the camp was using a row boat as a safety boat, with a camp staffer on board.
They say the boat may have drifted into the path of the zipline.
CBS 13 left messages for the camp director, but didn't hear back from anyone.
Zipline accidents fall under the jurisdiction of the State Fire Marshal's Office.
So do inspections, and authorities say that's all part of the investigation.
Police say the camp will not use the zipline until that investigation is complete.