Approximately 2,500 students and staff were evacuated as a precaution due to a bomb threat at the Christopher Columbus Campus.

The threat sent via a group chat triggered a major emergency response. At around noon, students appeared to be returning inside.

The NYPD’s Emergency Service Unit (ESU) and a K-9 unit responded to the scene.

The bomb squad was also deployed to investigate the threat. No injuries have been reported.

The campus, located at 925 Astor Ave., includes five schools - The Collegiate Institute for Math and Science (CIMS), Bronxdale High School, Astor Collegiate Academy, the High School for Language and Innovation and Pelham Preparatory Academy.

Students who spoke with News 12 said they were concerned they didn't have phones and couldn't contact their parents. The phones were inside the school due to New York's bell-to-bell phone ban.