The Montgomery County Police Department has launched a special detail at a Maryland high school over a “credible threat” that MS-13 is seeking “revenge” against at least one student.

The violent and notorious gang is extremely active in the state.

The threat of retaliation against students at Albert Einstein High School comes after a large fist fight at the school last week that involved a member of the gang.

“On Monday – and again Tuesday – the special police detail strategically placed 4D officers on and off school property during the 55-minute lunch period and afternoon dismissal,” WJLA reports.

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NEW: MoCo Police have formed a special detail at Albert Einstein High School in Kensington, Md. amid a “credible threat” that MS-13 is seeking revenge against at least one student there, police sources tell me. The detail is using 4D officers during the lunch hour and dismissal. pic.twitter.com/xeQXJBRwz3 — Kevin Lewis (@ABC7Kevin) October 29, 2019

“Are you out here because of the gang stuff,” one student asked ABC7 during afternoon dismissal while the station was at the school reporting on the story. “Everyone in school knows about it.”

The student provided the station with a video of the altercation, which showed “around 15 male students taunting and fighting one another on an athletic field.”

Principal Christine Handy sent an email to parents and guardians about the fight, saying that such behavior “won’t be tolerated.”

“I am writing to inform you about a serious incident that occurred today, [Friday] October 25,” Handy wrote. “There was an altercation between two large groups of students during lunch. Our security staff and SRO quickly responded to the incident and the Montgomery County Police Department was contacted to provide additional support. The officers responded to the school and quickly addressed the incident to restore order.”

Though the police have said the threat is credible, the school district is denying that there is a problem.