The shooting was reported at Independence High School, about 12 miles outside of Phoenix. The two teenagers were shot just before 8 a.m. in an "isolated" area of campus, Glendale police said.
Officers found both girls dead at the scene from a single gunshot wound, Officer Tracey Breeden, spokesperson for the Glendale Police Department, said at a news conference. She said this was not an active shooter situation.
The girls were found together with a weapon near them, Breeden said. Both girls were in the 10th grade, she added.
Police do not believe there are any outstanding suspects, Breeden said.
Two Teen Girls Dead in Shooting at Arizona High School
By EMILY SHAPIRO