Updated

Three people were shot Monday outside of a high school on Chicago's South Side, police said.

The trio was shot just after 4 p.m. near Chatham Academy High School in Burnside, the Chicago Sun-Times reported. Someone allegedly exited their vehicle and shot at them multiple times.

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The ages of the three unidentified injured males ranged from 16 to 18.

The 16-year-old suffered a gunshot wound to his left shoulder and remains in critical condition, while a 17-year-old was shot in his left leg and is also in critical condition.

The 18-year-old was shot in his right arm and left underarm, and remains in serious condition, the news outlet reported.

Police sources told the Sun-Times that one of the students was confirmed to be a student at the high school, but added they were working to confirm if the other two males were enrolled.

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One of the teens reportedly ran back into the academy after being shot. Assistant Principal Tony Lyons told WLS-TV that students "are taught that if they're in the area and they have an issue to come back to the school for a safe haven."

Two people were arrested "in the vicinity" following the incident, Chicago Police Chief of Patrol Fred Waller said.