The Journal News says it happened just before 6 p.m. Thursday outside Mount Vernon High School as the Mount Vernon-White Plains basketball game was ending.
The newspaper says police at the scene confirmed the shooting, but gave no other details.
Schools spokeswoman Desiree Grand told the Journal News that the victim was a 16-year-old high school student. She did not know his condition or what prompted the shooting.
Mount Vernon Police Department officials would not comment on the shooting but said details would be released Friday morning.