A young man is fighting for his life after he was stabbed multiple times outside West Philadelphia High School at 49th and Chestnut Streets. The stabbing happened at 2:35 a.m. on Tuesday. Both the victim and the attacker are 23 years old, according to police.

The victim suffered stab wounds to his back, leg and left side, and was taken to the Hospital of the University of Pennsylvania (HUP) in critical condition. The suspect was arrested and the weapon was recovered at the scene, police said. It is not known yet what led to the stabbing, as the investigation continues. The police were interviewing the suspect this morning and charges were expected to be filed, CBS Philly reports.