Police have upgraded charges against a teenage boy who is accused in the stabbing of a fellow Mount Vernon student.

According to police, a 15-year-old student was arguing with Joseph Ogilivie, 16, near the Mount Vernon High School library Monday when the older student pulled out a 5-inch kitchen knife and stabbed him in the stomach.

The victim was taken to Jacobi Medical Center in stable condition, suffering from a punctured lung. Ogilivie was initially accused of disorderly conduct, but now he faces a felony assault charge.

Mount Vernon High School Principal James Rutter says the school is going to step up security to try and prevent a similar incident from happening again. On Tuesday, however, another Mount Vernon High School student was arrested for allegedly bringing a knife to school.

?The superintendent is on it,? Rutter says. ?We're going to get metal detectors throughout the building and make sure no one [is] leaving things outside.?

Mount Vernon High School is planning an assembly for parents to discuss the stabbing on Feb. 9.

For an interview with Principal James Rutter about the stabbing, go to your digital cable box and select iO Extra, Channel 612.