NEW YORK (CBSNewYork) – Classes are in session Tuesday afternoon after a Manhattan high school was briefly placed on lockdown earlier.

The NYPD was called just before 8 a.m. about an intruder at George Washington High School on 192nd Street and Audobon Avenue.

Students were held outside as officers searched the building.

Police say the 29-year-old suspect was seen on the rooftops at the school. He was taken into custody and transported to Columbia-Presbyterian Hospital for evaluation.

The Department of Education says the campus was locked down before any students entered the building, and that all students and staff are safe.