Schools across Colorado are receiving anonymous bomb threats in the form of robocalls, forcing several buildings to evacuate students Monday as a precaution.

Cherokee Trail Elementary School in Parker, Colo., as well as schools in Colorado Springs and Pueblo were evacuated Monday in response to the threats, which the FBI and Joint Terrorism Task Force are aware of, KMGH‑TV reported.

Christine Harms, director of the Colorado School Safety Resource Center, told the station many schools around the country have also received bomb threats via robocall in the past few months.

Some schools in Colorado are evacuating, while others are not, Harms told the station.

Nothing suspicious has been found at any of the schools in Colorado that received the threats. The automated phone calls are being investigated by the FBI.

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