An attempted robbery quickly escalated into an officer-involved shooting at a Walgreens on the northwest side on Tuesday.
Pima County Sheriff Chris Nanos said a white man in his 30's entered the Walgreens pharmacy at Ina and Oracle just before 12:30 pm.
The man, 28-year-old Masoud Madhoush was carrying a semi-automatic handgun when he jumped over the pharmacy counter and demanded Percocet -- terrifying more than a dozen employees and customers.
Deputies arrived on scene within two minutes and chased Madhoush around the store while more deputies surrounded the store outside.
Minutes later, he ran out the front doors.
Deputy Jay Korza fired a shot with his rifle, hitting the man in the back. Nanos said because there were people in the parking lot and cars on the road, Korza "literally feared this man can do any number of things."
Korza, a trained paramedic, delivered first aid until the paramedics arrived.
Capt. Adam Goldberg with Northwest Fire said the man was taken to Banner University Medical Center with life-threatening injuries. No deputies were injured in the shooting.
Korza has been with the PCSD 15 years. He's on administrative leave -- standard for any deputy-involved shooting. Nanos has not released the name of the armed robber.
Watch the video above to listen to the chilling 911 call from someone inside Walgreens during the incident.
