Police arrested a 17-year-old they said slashed a student near a Bronx high school on Monday.

It happened around 2:30 p.m. near The Metropolitan High School in Foxhurst.

Investigators said the 15-year-old victim was cut across the chest.

He was taken to the hospital and treated for his injuries.

The NYPD said he knew his attacker and that they have had problems in the past.

It is not clear what led up to this slashing.