A suspect is in police custody after multiple students were stabbed during a fight at a Pittsburgh public high school on Wednesday morning, Sept. 24.About 8:30 a.m. local time, Pittsburgh police, fire and EMS responded to Carrick High School for an altercation that resulted in three students suffering stab wounds and one suspect taken into custody, the Pittsburgh Police Department told USA TODAY.The school is in a neighborhood about 5 miles south of downtown Pittsburgh.According to police, one student was transported to the hospital in critical condition, one student was transported in stable condition, and a third student received a minor laceration and was not transported.Officials said the two students taken to a hospital were being treated for stab wounds to the abdomen.Suspect in Pittsburgh school stabbing detainedAdditionally, a male was detained for questioning. According to police, that individual suffered a cut to his hand during the incident and was treated at the scene before being taken into custody.His age was not released, and police did not say whether he was a student.According to a Pittsburgh Public Schools statement obtained by USA TODAY, a student used a "small knife" to injure three other students.All four teens involved are between the ages of 15 and 18, police said.A motive in the stabbing was not immediately known.Lockdown lifted, Carrick High School 'safe'The school was placed into lockdown Wednesday morning, police said. The lockdown was lifted before noon ET, the district confirmed."Pittsburgh Police have confirmed the scene at Pittsburgh Carrick High School has been cleared, and the building is safe," the statement continued. "Out of an abundance of caution, Pittsburgh Carrick High School will remain in 'secure' status for the remainder of the day."As of early Wednesday afternoon, police said there was "no ongoing threat at the school" and Pittsburgh police Major Crimes detectives were investigating the attack.“We are deeply concerned for the students who were injured today, and our thoughts are with them and their families,” Pittsburgh Public Schools Superintendent Dr. Wayne N. Walters said. “I am grateful to Carrick staff, School Police, PPS Crisis Response team, City of Pittsburgh Police, and first responders for their immediate and coordinated response to keep our school community safe. I especially want to acknowledge the Carrick staff who worked tirelessly to keep students calm in a situation that was anything but calm, and to our students who showed resilience and cooperated with staff as the day continued under difficult circumstances.”Natalie Neysa Alund is a senior reporter for USA TODAY. Reach her at nalund@usatoday.com and follow her on X @nataliealund.