Hoover Elementary School, located at 890 Brockhurst St., went on lockdown around 9 a.m. after the school received multiple calls from someone threatening to harm students, Oakland Unified School District spokesman Troy Flint said.
School district and city police responded to the school and formed a perimeter, Flint said.
No one was allowed to leave or enter the school during the lockdown, during which instruction was continuing in classrooms, Flint said.
No injuries were reported and the lockout was lifted around 10 a.m.
