TACOMA, Wash. -- Police arrested a 15-year-old student at Mount Tahoma High School after officials said they found him with a loaded handgun and put the campus under a "high risk" lockdown on Monday.

Authorities detained and released several other students, then lifted the lockdown at about 12:15 p.m. and sent students home for the day.

RAW VIDEO: Lockdown At Mt. Tahoma High
VIDEO: Teenager With Loaded Handgun Forces Lockdown

During the lockdown, students off campus said students in classrooms told them the lockdown was a "high risk" one, requiring students to lie on the floor behind closed doors until the school was clear.

"They're just laying down, waiting to hear something," said Brittany Pike, a student. "They're on high risk."

Officials said the 15-year-old boy had been suspended and should not have been on campus when he was found with a loaded .32-caliber revolver.

Officials told KIRO 7 Eyewitness News reporter Kevin McCarty that investigators detained the other students because the students had contact with the suspect and they wanted to question them.

McCarty said it was not known why the student brought the gun to school.

The student was booked into Remann Hall, the juvenile detention facility in Tacoma, on suspicion of bringing a dangerous weapon onto school grounds.

Police said no one was hurt during the incident and no shots were fired.