Saginaw, Mich. ? Security guards used a metal detector to search Saginaw High School students Friday, a day after a sophomore was shot in the chest, allegedly by another 15-year-old who had been in a juvenile detention center with him.

Clarence W. Russell III was charged as an adult Friday with assault with intent to murder and five felony firearms charges in the shooting of classmate Daniel Foster.

Foster, meanwhile, remained hospitalized in critical condition, though surgeons determined the bullet didn’t hit any organs, police said.

“Hopefully he’s going to be all right,” police Sgt. Mark Lively said.

The boys’ high school has grappled with several violent incidents in the past year, and authorities said they believe the lunch hour shooting inside the school may have been gang-related. Saginaw County Prosecutor Michael D. Thomas would not say how authorities believed gangs were involved.

“I didn’t know what to think of it,” said ninth-grader Lashunta Cole, 14, who was in math class when the shooting happened one floor above her. “It was crazy.”

Since December, shots were fired in the school’s parking lot, a 17-year-old attempted to slash another student’s throat in the hall, two teens attacked a police officer in the parking lot after a basketball game, and a drive-by shooter opened fire as hundreds of students were leaving the homecoming dance, injuring two.

Disputes that begin on the streets are carrying over into the schools, school district spokesman Michael Manley said.

“That’s what makes this so difficult to get a handle on,” he said. “There’s so much violence in this community.”

A metal detector was installed at the high school after the shooting, and students were asked to report a half-hour early to avoid lines at the entrance. Attendance appeared to be normal Friday and no weapons were found, he said.