UPDATE (Saturday, 12:18 p.m.): Police say both youths are from near 38th Street and Haverford Avenue. The alleged assailant now faces a homicide charge. Police are not releasing any names because both are juveniles. It is likely, however, that the alleged assailant will be charged in adult court and his name will be released later.

UPDATE (9:42 p.m.): Several media outlets are reporting that the 14-year-old boy died. 6ABC reported that the boy died at 8:55 p.m. at Children’s Hospital of Philadelphia.

UPDATE (7:40 p.m.): Police say a 16-year-old boy, also a West Philly High student, has been arrested and faces aggravated assault and related charges. A confrontation between the two boys reportedly began earlier in the school day in the high school’s cafeteria.

6:24 p.m.: A 14-year-old West Philadelphia High School student was stabbed this afternoon three blocks from the school, according to police. The student was reportedly stabbed in the chest and is listed in critical condition this evening. The stabbing occurred near 46th and Market at around 3:25 p.m. Police are searching for another student, who reportedly ran up behind the victim while he was riding his bike and stabbed him.