Adams City High School was put on modified lockdown Friday morning after a student’s gravity bong — a device that uses the force of gravity to pull large amounts of cannabis into a chamber — released smoke in a classroom, officials said.

“As a precautionary measure our students were placed on a modified lockdown to limit movement throughout the school,” the school said in a release. “School resource officers and nurses are on site as a precautionary measure to address the needs of students if necessary.”

The smoke was released about 9:45 a.m. in the Commerce City school, said Breanna Deidel, a spokeswoman for the school district.

“Everybody is safe,” Deidel said. “The kid who did it is in the office meeting with the disciplinary team right now.”

A strong marijuana smell was released into the school, Deidel said. Several students were monitored by the school nurse before they were released.

The student was not identified.

Jesse Paul: 303-954-1733, jpaul@denverpost.com or twitter.com/JesseAPaul