CHICAGO (CBS) — One person was in custody Wednesday morning in connection with the armed carjacking of a teacher at Whitney Young Magnet High School.

School officials said the teacher was sitting in her car in the staff parking lot around 8 a.m. Tuesday, when a male teenager walked up, claiming he was “being chased and needed help.”

Police said the teen got into the passenger side of the victim’s vehicle, pulled out a gun, and demanded the teacher’s purse, phone and car. The teacher handed over her phone and purse, and got out of the car, and the robber drove away. The teacher was not harmed.

Wednesday morning, Police Department spokesman Anthony Guglielmi said detectives and FBI agents took a person of interest into custody.

Whitney Young officials requested extra officers at the school in the wake of the carjacking, and are seeking additional security cameras.

“The safety of our school communities is the district’s highest priority and we are grateful the teacher was not physically harmed during the encounter,”Chicago Public Schools representatives said in a written statement. “The district is working with the Chicago Police Department to provide additional vigilance in the surrounding area and ensure all safety measures and protocols are as strong as possible, and the district has made supports available to the teacher.”