The lockdown at Sunnyside High School was lifted after Tucson Police determined it was safe to do so.
According to Mary Veres, the public information officer for SUSD, police found the student who two girls thought had a gun. The student did not have a gun, Veres said.
Veres said two girls thought they saw a student carrying a gun and called 911 and told school personnel.
Tucson Police searched the campus at 1725 E. Bilby Road for the student identified by the girls, Veres said.
Tucson News Now's Carissa Planalp is at the scene and we will update this story as details emerge. She can be followed on Twitter at @CarissaTNN.
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