Three students were injured at Carrick High School on Wednesday morning following a stabbing, authorities said.

Pittsburgh police, firefighters and EMS personnel were dispatched to the school for a "critical incident," Pittsburgh Public Safety said Wednesday morning . A spokesperson for Pittsburgh Public Schools released a statement detailing the incident, saying a student used a "small knife" to injure three students aged 15 to 18 years old.

Of the three students injured, one was treated and released at the scene, one was transported to UPMC Children's Hospital in stable condition, and a third was taken to UPMC Mercy with a more serious injury, officials said.

The 16-year-old student responsible is in custody, authorities said. The suspect also sustained a laceration to his hand.

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