India, Sept. 24 -- Three students from Carrick High School were attacked Wednesday morning right inside the front doors of the institution, according to Pittsburgh police.

Cara Cruz, a Pittsburgh police spokeswoman, said one person was in serious condition and another was in stable condition, TRIB LIVE reported.

According to police, a third person was treated on the spot for a "minor laceration" and then discharged.

A suspect is in the police custody and has been brought to the North Side police headquarters for questioning.

Meanwhile, Pittsburgh Public Schools issued a statement, saying that a student "used a small knife to injure three other students."

"All students are receiving medical attention. While details are developing, we ...