ARLINGTON – Presidents Elementary and the Arlington Public Schools district office were placed on modified lockdown today in response to threats made by a district employee.

Arlington police and school staff had an increased presence at the school throughout the day while police investigated.

Arlington Police have the suspect in custody.

Arlington police train with school personnel frequently on emergency events, Police Chief Jonathan Ventura said.

“This training allowed the Arlington Police Department to ensure the safety of all students and staff at the school and district office while continuing their investigation into the threats,” he said.

Arlington Public Schools Superintendent Chrys Sweeting commended staff and students “for their incredible response to the incident.”

She thanked police for their “swift action and for their ongoing support to ensure our schools are safe.”