A spokeswoman for the Yuma Police Department told Yahoo News that officers responded to Rancho Viejo Elementary School at approximately 9:55 a.m. local time. That school, along with nearby Salida Del Sol Elementary School and WACOG Preschool, were placed on lockdown, she said.
Students at Salida Del Sol could be seen filing into the cafeteria with hands on their heads in front of armed police officers observing the scene.
Students at Rancho Viejo Elementary were taken by buses to a different elementary school, H.L. Suverkrup, where parents could pick up their children while police continued their investigation. The lockdown at the other schools was lifted Tuesday afternoon.