PITTSBURGH — One student is dead and another is in custody after a shooting outside a school in Pittsburgh early Wednesday, authorities said.

The ages of the students involved were not immediately clear. According to the city’s school district website, Oliver Citywide Academy is a full-time special education center serving grades 3-12.

It was not immediately clear what sparked the shooting, The Pittsburgh Post Gazette he said it happened around 7:25 a.m. on the stairs outside the school. No other injuries were reported, and police said they found a weapon at the scene.

The names of the students have not been released, but police said they were both attending the school and under the age of 18. Authorities said the injured student was taken to a hospital where he was pronounced dead a short time later.

“We believe, based on the information we have and the video we have been able to view, that we have the actor in custody and there is no potential threat to the other schools,” Pittsburgh’s major crimes commander said. Richard Ford said during a press conference at the school. He said the victim was killed as he was walking to school.

It was not immediately clear how many students and staff witnessed the shooting. Maria Montano, a city spokeswoman, said most of the students were still on their way to school when the shooting occurred and the buses were diverted to another school building.

Students already at the school were kept in the building. Classes there were canceled for the day after the shooting.

The shooting came just over a year after another student was shot at the school. Marquis Campbell, 15, was murdered in January 2022 while sitting in a school van waiting to go home. The alleged shooters, two brothers Campbell knew from another school, were charged earlier this year with murder and conspiracy.