CHICAGO (CBS) — A boy was stabbed in the neck Tuesday morning at East Leyden High School in Franklin Park. Another boy was in custody, and students were sent home early, after the school was forced to go into lockdown.

According to the Rosemont Public Safety Department Supt, the victim is “out of of surgery and recovering.”

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The supt. confirmed the lockdown at East Leyden was lifted just before 11:40 a.m. and school will be dismissed for the rest of the day.

Officials confirmed the incident took place inside the school.

East Leyden High School is located at 3400 Rose St. in Franklin Park.

In an email to the school community, East Leyden officials provided an update to the incident they described as a “serious altercation between two students.”

“The school went into an immediate lockdown and the police responded promptly,” the email stated. “The offender has been apprehended by the police and the victim is receiving medical attention.”

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School officials said the situation is “contained” and is being “handled by the police.”

Officials said Franklin Park police are at the school helping parents reunite with their children.

Police told CBS 2 the offender pulled out a small knife in a hallway on the second floor of the school and officers immediately located the student with the knife.

The victim’s brother told CBS 2 the attacker may have warned about the stabbing in a social media post.

Police are now interviewing witnesses and looking through video footage.

Officials confirmed school will be back in session on Wednesday Social workers will be at the school on Wednesday and police will be at the school the rest of the week.

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This is a developing story.