A 16-year-old girl innocently riding her scooter outside a Bronx school was shot in the head and killed by a teenage boy Monday after a fight broke out among youths leaving the schoolyard, police officials said. 

The girl, identified as Evette Jeffrey, was not involved in the melee between teen boys that escalated when one of them opened fire outside their Morrisania schoolyard around 5 p.m., cops said. 

Investigators are looking for a 14-year-old boy who they believe pulled the trigger, firing off at least three shots, according to police.

“Our city has suffered another senseless tragedy tonight,” NYPD Commissioner Jessica Tisch said at the scene of the deadly gun violence. “A 16-year-old girl playing in a school yard is now dead. And a 14-year-old is wanted in connection with her death.”

The teen boy was allegedly involved in a fistfight outside the building at 800 Home Street, which houses three separate schools — the Dr. Richard Izquierdo Health and Science Charter School, Bronx Latin and the Bronx Career and College Preparatory High School. 

Security footage showed a group of youths leaving the schoolyard and entering a walkway alongside the school building, where the brawl breaks out, according to Tisch. 

One boy walks up to a rival teen and punches him in the face, knocking him down, Tisch said. A second boy begins throwing punches at other people in the crowd.

The hooligans gravitate toward Union Avenue, where the boy who was first knocked down runs toward the rival who hit him and opens fire, she said, citing the footage.

“It then appears that someone passes the first male a pistol,” Tisch said. 

He fires three rounds into the crowd — and strikes Jeffrey, who was leaving the schoolyard on her scooter, the top cop said. 

One of the victim’s friends tried to shield her from the gunfire, but couldn’t save the teen.

“While this is happening at the other end of the walkway, the victim is seen riding from the schoolyard toward the walkway on a scooter,” Tisch said. “She is not engaged in the fight and immediately walks over to another male member at the edge of the group who attempts to pull her behind a brick wall for cover.” 

The girl, who was an “unintended target,” was struck in the head, the commissioner said.

“She immediately falls to the ground, while the other children run away for their lives.” 

Jeffrey was rushed to Lincoln Hospital, where she was pronounced dead.

Mayor Eric Adams visited the scene of the pandemonium along with other city officials to offer their condolences Monday night.

“Several lives are destroyed,” Adams said of the deadly shooting.

“We know that we have an obligation to create safe environments for young people. And that is what we try to do every day,” he added.

Adams encouraged the parents to be vigilant about what their children bring home, asking them to search their kids’ bookbags and bedrooms.

He promised to bring more patrols to the schools and asked the parents to hold up their end of the bargain.

“We should not have had a 14-year-old with a gun,” he said. 

No arrests had been made as of late Monday and the investigation is ongoing. It’s unclear what school the suspect attended. 

The teen’s killing would be the first murder in the 42nd Precinct this year. The Bronx has seen a precipitous decline in violent crime in the first quarter of the year, with a nearly 30% drop in murders and a 30% drop in shootings borough-wide from last year.

Additional reporting by Dorian Geiger and Larry Celona