Authorities on Saturday identified the second boy killed in a shooting outside a Pilsen high school as police continued searching this weekend for a person seen on surveillance video running away from the scene where two other teens were wounded.

The Cook County medical examiner’s office confirmed 14-year-old Nathan Billegas was slain in the attack, which also left 15-year-old Brandon Perez dead shortly after dismissal Friday afternoon near Benito Juarez High School, 2150 S. Laflin St.

Both boys were shot in the head shortly after 2:30 p.m., according to Chicago police. They died soon after at Stroger Hospital.

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Two boys killed, two other teens wounded in shooting outside Juarez High School on West Side

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Two other teens, a 15-year-old boy and a 15-year-old girl, were taken to the same hospital with gunshot wounds. They were listed in good condition, police said. The boy was struck in the thigh and shoulder; the girl suffered a graze wound.

A radio dispatch to officers said a suspect in a black mask, black hoodie and black North Face jacket was seen running west on Cermak Road and north on Ashland Avenue.

Police haven’t said whether the victims were Juarez students or whether any were targets of the gunfire.

Constance Jones, the CEO of Noble Schools, said in a statement that one of the teens who died and one who was injured are students in the charter network. It wasn’t clear whether she was referring to Billegas or Perez.

“We recently learned about senseless gun violence that took the lives of two students and injured two others outside of Benito Juarez High School,” Jones said in a statement.

“We send our condolences to the families of these students and we stand in solidarity with the Benito Juarez High School community as they grieve during this time. Noble and CPS are working with CPD as they confirm further details. I am deeply saddened whenever gun violence impacts our schools and communities.”

Mayor Lori Lightfoot condemned the shooting Saturday, saying she was “beyond outraged by this incident, which highlights the pressing need for illegal guns to be taken off our streets and out of the hands of those seeking to cause harm.

“… I want to express my sincerest condolences to the family and friends of the students whose lives were ripped away from them far too soon and without warning,” Lightfoot said in a tweet. “My prayers are also with the students who are recovering in the hospital this afternoon, as well as the larger Benito Juarez High School and the Pilsen community. This incident is undoubtedly upsetting and unfortunately builds on the trauma that far too many of our residents have experienced with gun violence.”

CPS officials said Friday that the district will work with the principal and staff over the weekend to ensure counseling services are in place for students when they return Monday. Security will also be stepped up, though school officials gave no details.

Police asked anyone with information to call Area Five detectives at (312) 744-8261, or submit an anonymous tip at cpdtip.com.

Contributing: Allison Novelo