A weapon was found near them, she said.
“We don’t believe that there are any suspects that are out there .. that we’re searching for,” Breeden said.
The shooting prompted authorities to lock down the building as they investigated, police said.
“It’s been stabilized, and students are not in (further) danger,” Officer Breeden said.
The shooting happened at a covered patio area near the main building before 8 a.m., Breeden said.
“The incident was isolated. The school and neighborhood are safe,” Glendale police said on Twitter.
Police asked students’ parents to gather at a nearby Walmart to await further information. Video from CNN affiliate KNXV-TV showed scores of people gathered in the store’s parking lot as well more standing across the street.
“Our prayers are with the students, educators & families at Independence High School & all the first responders on the scene,” read a post on Arizona Gov. Doug Ducey’s Twitter account.
Independence High School opened in 1977 and is part of the Glendale Union High School District. More than 2,000 students are enrolled.
Glendale is a city of about 230,000 just northwest of Phoenix.