The safety chief for the county's schools, Thomas Trawick, says the shots were fired in a Mount Zion High School parking lot after an argument between people who had attended a ceremony for graduates of the Perry Learning Center, which prepares students for careers as an alternative to traditional high schools. Braun says the officer remains in critical condition.
On Friday, there were reports of possible explosive devices discovered at the school, the suspect's home and in a vehicle, according to officials.
The assailant's homemade explosives included pipe bombs, at least one Molotov cocktail and pressure-cooker bombs similar to those used in the Boston Marathon attack, authorities said.
Pagourtzis played on the junior varsity football team and was a member of a dance squad with a local Greek Orthodox church.
Pakistani businessman Abdul Aziz Sheikh says he learned of the tragedy unfolding at a high school in Texas when he turned on the TV after iftar, the fast-breaking meal during the Muslim holy month of Ramadan.
He called his daughter's friends, but they weren't responding either.
Nine students and one teacher were killed, a law enforcement official told CNN.
She said: "Give us our time right now, thank you".
"On behalf of the Texans organization, we are saddened by the tragic events at Sante Fe High School this morning and extend our thoughts and heartfelt condolences to the victims, their families and all those affected".
"He was bleeding out and his blood pressure was very low, so the immediate issue was to resuscitate him and give him enough blood product to get his blood pressure up and take him straight to the OR", said a surgeon.
Pagourtzis said little during a video court appearance Friday, answering, "Yes, sir", when asked whether he wanted a court-appointed attorney.
He says authorities recovered a couple of explosive devices at the school and "several" in Pagourtzis' vehicle and home, and that they've been sent for testing to the Federal Bureau of Investigation laboratory in Quantico, Virginia.
Friday's assault was the deadliest in Texas since a man with an assault rifle attacked a rural church late past year, killing more than two dozen people.
Hospitals on Friday reported treating a total of 14 people for injuries related to the shooting.
Several questions remain unanswered following Friday's mass shooting at a Texas high school. A 17-year-old student, Dimitrios Pagourtzis (puh-GOR'-cheez), has been arrested in the attack on murder charges.
It was the nation's deadliest such attack since the Florida massacre that killed 17 and energized the teen-led gun-control movement.
Santa Fe student Shana Fisher was one of the 10 people killed Friday in the shooting at her high school, according to her mother.
In Texas, senior Logan Roberds said he was near the school's art room when he heard the fire alarm and left the building with other students. Authorities offered no immediate motive for the shooting. He was ordered held without bond.