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A 10-year-old in New Jersey fell to his death from the window of a classroom on the second floor. His death is being investigated as a possible suicide.

The boy had gotten into an argument with a classmate over a game of chess. Later, he passed another student a note, opened the window and jumped. While sources have not described the note as a suicide note, suicide is still being investigated as a possibility.

Witness say the boy may still have been conscious after he hit the concrete.

“I saw him moving, wearing trousers, I saw him moving his legs, and his hands, and they were attending to him,” Elmer Pascia told ABC7. “When I looked, there was a lady in the window, like you know, talking to the people down below frantically.”

Although the boy was rushed to Hackensack University Medical Center, he died of his injuries.

Watch local coverage of the tragedy below.