Drew said the calls police received with descriptions of the intruder were “dead-on accurate” and aided officers in locating him within two minutes.

Police received calls from students who advised seeing armed individuals inside the school, but they were “police officers walking in and clearing the floors as a team,” Drew said.

Students inside during the lockdown said they were told to remain in their classrooms and not to leave for any reason.

One student who didn’t comply was led off in handcuffs.

The student said he was in the library for about two hours and needed to use the restroom. When he stepped into the hall, a police officer pointed a rifle at him and yelled at him to get down.

“I kept telling him, ‘I’m not the guy, I’m not the guy’ ” said the student, man who would not give his name because police told him not to speak to anyone about what happened.

He was placed in handcuffs and driven away in an unmarked car. About an hour later, he was back and standing a few feet away from a side entrance where police were set up. “I guess I’m OK with it because I got to go to the bathroom,” he said.