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(NECN: Kathryn Sotnik, Easton, Mass.) - A 10-year old boy is in critical condition at Children's Hospital in Boston following a zip-line accident in an Easton, Mass. backyard.
The Bristol County District Attorney's Office says the zip-line, which was attached to two trees, brought down a towering pine right on top of the boy.
The boy tried to jump off the line, and scrambled to get out of the way, but it was too late.
"The next thing you know, the tree fell and we heard 'oh my God," said Walt Tyldesley Jr, of Voorhees, N.J.
Tyldesley was visiting a house next door.
"He was still trying to breathe. When the paramedics took his jacket and opened it up, you could see the big bruise mark along his lower back," he said.
Tyldesley said he held the boy's hand and asked him to squeeze his fingers.
The unidentified boy was rushed to a local hospital.
Thursday night, he was transferred to Children's Hospital in Boston. His injuries are unknown.
"It's a tough day for everybody," said a man at the home Thursday. "If you could just, kind of let them go and pray that he'll be alright."
According to neighbors, the boy was visiting the family who live at 4 Shagbark Road.
Tyldesley believes the home zip-line may have been a Christmas present.
"I know they're very active outdoors, very outdoors, very active people, very athletic," said Lorna Paone, a neighbor.
Some neighbors believe the tree may have been rotted and that the family may not have known that when they attached the zip-line.
The Bristol County District Attorney's office says the incident appears to be an accident.