Desert View High School officials sent students home early on Monday after a bomb threat was reported at the school.
The bomb threat was reported at about 9:40 a.m. after an off-duty police officer who works at the school found a threatening note at the school, said Sgt. Maria Hawke, a Tucson Police Department spokeswoman.
School officials began evacuating students about 10 minutes later, Hawke said.
The threat was not considered credible, but Tucson police sent officers with bomb-sniffing dogs to the school as a precaution.
Sunnyside Unified School District officials decided to send students home, anticipating the investigation would last several hours, according to the district.
The investigation ended around noon, Hawke said.
No devices or suspicious packages were found.
Contact reporter Jamar Younger at firstname.lastname@example.org or 573-4242. On Twitter: @JamarYounger