Immigration agents in Los Angeles on Monday mistakenly detained a 15-year-old boy with disabilities, dragging him from a parked car while his grandma was in a nearby high school helping another family member register for classes.

According to Los Angeles Unified School District Superintendent Alberto Carvalho, who reviewed video of the incident, authorities who approached the boy first assured him they weren’t enforcing immigration law, nor were they part of Immigration and Customs Enforcement.

The footage shows the masked agents who surrounded the car were wearing tactical vests reading “POLICE” with what appears to be “U.S. Border Patrol” written underneath, Carvalho said at a press conference Monday.

“It is disturbing. It is heartbreaking. It is reprehensible,” he said of the incident.

“This young man was placed in handcuffs, presumably based on mistaken identity. He was not an adult. He’s a 15-year-old boy with significant disabilities,” Carvalho said, praising the Arleta High School principal for “courageously” stepping in to stabilize the situation.

The district has since asked federal agents to respect what it’s calling “areas of protection” and to cease activity one hour prior to the start of school and one hour after the school day ends. Classes are scheduled to start on Thursday.

A U.S. Customs and Border Protection spokesperson told HuffPost its agents didn’t intend to target the high school and were instead attempting to arrest a Salvadoran immigrant with prior criminal convictions.

According to a statement from school board member Kelly Gonez, the unidentified agents drew their guns on the teen, who, because of his disabilities, is noncommunicative.

Agents reportedly left live bullets behind.

“After the agents left, the principal and other individuals detected that they left behind bullets. Ammunition. Bullets!” Carvalho later told reporters.

When federal agents were asked to retrieve the live ammunition scattered outside the school, the agents reportedly told the school district to keep the bullets and use them for target practice.

“That’s not suitable for us,” Carvalho responded. “Come and get what you left behind.”

The boy was released after the school principal intervened, backed by officers from the Los Angeles School Police Department.

“The release will not release him from what he experienced,” Carvalho said. “The trauma will linger. It will not cease. It is unacceptable.”

In light of the incident, the district will be deploying roughly 1,000 staff around LA schools and other “critical areas” for the safe passage of students, in addition to adding more bus routes and conducting virtual “know your rights” workshops.