45 students pepper sprayed in school fight

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Credit: KSNV via CNN Credit: KSNV via CNN

Four students were arrested after a massive brawl at a high school in Las Vegas.

Dozens of others were treated for exposure to pepper spray that police used during the incident.

Dramatic video captured the chaos inside the high school.

Clark County School District Police said an argument between two groups of students quickly turned into a fight that grew out of control.

About 45 to 50 people were affected by pepper spray, some of which needed medical attention.

So, what caused the fight?

District police said cultural or racial differences could be to blame.