A student’s “threatening” comment forced the lockdown of Arvada High School today, Feb. 8, according to a Jeffco Public Schools spokeswoman. All students are safe and there is no indication of an immediate threat.

It’s unclear what exactly the student may have said, but it caused another student to figuratively “sound the alarm,” said Cameron Bell of Jeffco schools.

The lockdown restrained students and most staff to their classrooms for about an hour, she said. About 20 officers with schools security and Arvada police investigated the threat, according to a police spokeswoman. The lockdown began shortly after 11 a.m.

“Whenever there’s a lockdown, even if they know from the beginning it’s not real, they still have to follow the district procedure,” Bell said. “They go through every classroom and clear it … bathrooms and closets and everything.”

They found no devices, weapons or any other indication of an immediate threat, she said.

No one is in custody but the investigation was ongoing as of about 4:15 p.m., according to Arvada police spokeswoman Jill McGranahan. She could not confirm whether or not a student’s threat had prompted the lockdown.