ROCHESTER, Minn. (FOX47) -- A Rochester elementary school was placed on lockdown after a "potential threat" was made to some of the staff members over the phone.
According to an email from Rochester Public Schools, the adult who called was not at the school at the time. The email said the school was placed on lockdown at about 10 a.m.
The district said the emergency alert system was activated, setting off alarms and lights throughout the school and Rochester Police Department officers came to the school. Students and staff remained in their classrooms.
The lockdown was called off after about 20 minutes, according to the school.
Principal Kristin Engbrecht said the threat was not inside the building and that all students and staff are safe.
"Again, the safety of our students and staff is our top priority. The threat was never at our building, and our students and staff are all safe," Engbrecht said in the email.