Authorities did not find a bomb in the school.
MESA, Ariz. - Dobson High School was placed in lockdown Friday morning after a bomb threat was written on a mirror in a bathroom, according to Mesa police.
The school is located near Guadalupe and Dobson Roads.
Authorities did not find a bomb in the school and one student was detained.
No information about the student or a motive behind the threat have been released.
The lockdown was lifted by 11 a.m. and students have returned to their classrooms.