The teen is being held in lieu of $75,000 bail on charges of attempted murder, attempted assault and weapons possession.
Geoffrey Canada, who runs the Promise Academy Charter School, said he hopes the arrest sends a message to other kids to stay away from guns.
“I’m pleased that the police made an arrest and this young person will have to deal with the criminal justice system,” Canada said.
“I’m never happy to see a young boy or girl end up in the criminal justice system, but we can’t have folks out using weapons.”
The teen was charged Friday as juvenile but is being prosecuted in adult court. He would face a reduced sentence if convicted.
A security camera at the E. 125th St. school filmed him firing a handgun into a crowd on the sidewalk after a dispute last Tuesday, court documents said.
Kenneth Taylor, 18, was shot in the shoulder but not seriously injured.
The gunman and his pals ran off, and another camera captured them skulking into an apartment building, court documents say.
The 15-year-old’s sweatshirt was weighed down by a heavy object, apparently the gun, police said. He took off the hoodie in the elevator, and a friend carried it into an apartment, where it was found by a detective.
“There are no guns up in here,” a woman at that apartment insisted. “The police searched this place and I searched this place.”
Cops said the shooter lives on E. 132nd St., but a neighbor there said he and his mom moved to the Bronx right after a shooting outside the building.
The mother knocked on the neighbor’s door the morning after the gunplay and seemed worried.
“The mother asked me if I saw anybody,” he said. “She said, ‘You didn’t see nobody walking?’
“The next month, I saw moving trucks outside.”
The suspect did not attend Promise Academy. When he was younger, he was in an after-school program run by Canada’s Harlem Children’s Zone, a $75 million network of services for 10,000 kids.
Canada said he met with his high-school students Thursday to discuss the shooting and safety.
“We’ve got a lot of work to do in our community,” he said.
“The challenge with a handgun is they often use them and don’t know the consequences. It’s extremely important that we solve these crimes and we need to make sure the punishment fits the crime.”
“It’s a national crisis,” he added. “We’re going to need some help to change some of these laws that allow folks to buy multiple weapons and ship them to Harlem.”