CONCORD -- Students at Mt. Diablo High School were evacuated and sent home after a note was found on campus threatening to "blow the school up," a school official said.
At 10 a.m., a teacher at the high school, located at 2450 Grant Street, notified staff of her discovery. Concord police arrived shortly thereafter and school administrators ordered the evacuation, said Mt. Diablo Unified School District spokesman Bill Morones.
The district sent a message to parents about the evacuation and over the next few hours, parents worked with staff to pick up their children.
A handful of parents became somewhat unruly, according to police, but ultimately all students were reunited with parents.
"At every site, our number one priority is safety," Morones said. "I am extremely proud of how staff and students behaved and handled (the evacuation)."
Administrators and bomb-sniffing dogs canvassed the school grounds, but nothing was found, according to Morones. The school, however, did remain closed the rest of Thursday, though the area was cleared around 3 p.m. School will resume as scheduled Friday.
No one was injured.
An investigation into who left the note at the undisclosed location on campus is ongoing.