Four New York City men have been arrested in the attack of a student outside Sayreville High School on Thursday afternoon, authorities said.

The teen was attacked because he had an earlier dispute with another student who is a family member or associate of the four adults, Sayreville police said.

Video recorded by bystanders at about 2:15 p.m. shows an adult pulling a knife and beating the victim, according to police.

Officers and school security swarmed the area and arrested two men in nearby Kennedy Park.

Two other men one of whom was in possession of a knife were arrested about two hours later after police posted a photo of one of them on social media.

The student who was attacked suffered minor injuries as a result of the assault, according to police. He was not stabbed.

Christoper E. Torres, 24, of Staten Island, is charged with aggravated assault and conspiracy to commit assault.

A 25-year-old Brooklyn man and a 19-year-old Staten Island man were both charged with assault and conspiracy to commit assault. A 27-year-old Staten Island man was charged with possession of metal knuckles.

A brief shelter in place at Sayreville High School was lifted following the incident.

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Jeff Goldman may be reached at jeff_goldman@njadvancemedia.com.