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A 17-year-old student, who sources identify as Christopher Batres, was stabbed in the back at Newtown High School in Elmhurst on Friday by a fellow student.

Department of Education officials said a steak knife was used.

He was taken to Elmhurst Hospital in stable condition.

The NYPD said the stabbing was a result of an ongoing dispute.

Sources said police were looking Friday for Brian Goody, 16, in connection with the incident.

Some students at the school believed that the incident may have been gang-related.

The school was briefly put on lockdown.

"They said it was because somebody got stabbed so we were all in our classes until the principal directed that we could get out," said one student.

"Well I was scared. They kept us locked in the classroom and they did not let us out," said another. "They held us for the next period and everyone was just wondering what was going on."

Police said an accomplice was arrested in connection with the incident. Officials said the arrested suspect threw the knife out the window after the stabbing.

A second stabbing incident occurred at the High School for Media and Communications inside the George Washington High School Campus in Washington Heights.

The DOE said a 15-year-old student was stabbed by a classmate 16 times in the back and arm with a steak knife.

The student was taken to Columbia Presbyterian Hospital with non-life threatening wounds.

The student's 14-year-old classmate, who was taken to the 34th Precinct, said it was retaliation for having been teased and bullied by the victim for a long time.

Fellow students said they were worried that someone could bring a knife into school.

"There's metal detectors and everything, so how is he able to bring a knife to school? I mean it just scares me," said one student.

We actually saw the boy, like, limping, walking out. But it's not about us finding out what's going on, it's just that it's unsafe," said another. "And it's crazy."

Then on Friday afternoon, DOE officials said a 15-year-old student was stabbed twice in the back on Linwood Street, about two blocks away from I.S. 302 in East New York, Brooklyn.

A school safety agent saw another student toss a knife. That student was arrested.

The injured Brooklyn student, who was stabbed after school was dismissed, was taken to Brookdale Hospital.

Schools Chancellor Joel Klein said that DOE officials cooperated with all three NYPD investigations.

"So far this school year, major crime in schools is down 10 percent over last year’s record lows, but today’s troubling incidents make clear the importance of our obligation to make schools a safe environment for learning," said Klein. "[...] In the last eight years, major crime in our schools has been cut nearly in half, but any level of violence in our schools cannot be tolerated.”

DOE figures show that violent crimes in school from January to March 7 of this year are down 4 percent from the same period last year.