In this image taken from video a police officer walks near school buses as law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. (KTRK-TV ABC13 via AP)
This photo provided by the Galveston County Sheriff's Office shows Dimitrios Pagourtzis, who law enforcement officials took into custody Friday, May 18, 2018, and identified as the suspect in the deadly school shooting in Santa Fe, Texas, near Houston. (Galveston County Sheriff's Office via AP)
SANTA FE, Texas (AP) โ A gunman carrying a shotgun and a revolver opened fire at a Houston-area high school Friday, killing 10 people, most of them students, authorities said. It was the nation's deadliest such attack since the massacre in Florida that gave rise to a campaign by teens for gun control.
The suspected shooter, who was in custody, also had explosive devices, including a molotov cocktail, that were found in the school and nearby, said Gov. Greg Abbott, who called the assault "one of the most heinous attacks that we've ever seen in the history of Texas schools."
The assailant intended to kill himself but gave up and told authorities that he did not have the courage to take his own life, Abbott said.
Another 10 people were wounded at the school in Santa Fe, a city of about 13,000 people roughly 30 miles (48 kilometers) southeast of Houston. One hospital reported treating eight wounded patients. Six were treated and released. One was listed in critical condition, and another in fair condition.
Michael Farina, 17, said he was on the other side of campus when the shooting began and thought it was a fire drill. He was holding a door open for special education students in wheelchairs when a principal came bounding down the hall and telling everyone to run. Another teacher yelled out, "It is real!"
Students were led to take cover behind a car shop across the street from the school. Some still did not feel safe and began jumping the fence behind the shop to run even farther away, Farina said.
"I debated doing that myself," he said.
A law enforcement official identified a person in custody in the shooting as Dimitrios Pagourtzis, also 17.
The official was not authorized to discuss the shooting by name and spoke on condition of anonymity to The Associated Press.
A woman who answered the phone at a number associated with the Pagourtzis family declined to speak with the AP.
"Give us our time right now, thank you," she said.
Pagourtzis plays on the Santa Fe High School junior varsity football team, and is a member of a dance squad with a local Greek Orthodox church.
The suspect used a shotgun and .38-revolver obtained from his father, who owned them legally, Abbott said. It was not clear whether the father knew his son had taken them.
One or two other people of interest were being interviewed about the attack, Abbott said.
The shooting was all but certain to re-ignite the national debate over gun regulations. While cable news channels carried hours of live coverage, survivors of the Feb. 14 attack in Parkland, Florida, took to social media to express grief and outrage.
"My heart is so heavy for the students of Santa Fe High School. It's an all too familiar feeling no one should have to experience. I am so sorry this epidemic touched your town โ Parkland will stand with you now and forever," Marjory Stoneman Douglas student Jaclyn Corin said in a tweet.
In this image taken from video law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image taken from video law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image taken from video a police officer walks near school buses as law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image taken from video helicopters sit in the parking lot of Santa Fe High School as law enforcement officers respond to the school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying the high school has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image taken from video law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
This image taken from video shows the campus of Santa Fe High School, Friday, May 18, 2018, in Santa Fe, Texas. Law enforcement officers responded to the school near Houston after an active shooter was reported on campus. The Santa Fe school district issued an alert Friday morning saying the high school has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image made from video, people stand near school buses outside Santa Fe High School in Santa Fe, Texas, on Friday, May 18, 2018. An active shooter was reported on campus Friday. (KTRK-TV ABC13 via AP)
In this image taken from video emergency personnel and law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
In this image taken from video law enforcement officers respond to a high school near Houston after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. The Santa Fe school district issued an alert Friday morning saying Santa Fe High School has been placed on lockdown. (KTRK-TV ABC13 via AP)
Santa Fe High School junior Guadalupe Sanchez, 16, cries in the arms of her mother, Elida Sanchez, after reuniting with her at a meeting point at a nearby Alamo Gym fitness center following a shooting at Santa Fe High School in Santa Fe, Texas, on Friday, May 18, 2018. (Michael Ciaglo/Houston Chronicle via AP)
School staff members sit in a school bus to be transported to another school after a shooting at the Santa Fe High School in Santa Fe, Texas, on Friday morning, May 18, 2018. (Jennifer Reynolds/The Galveston County Daily News via AP)
School staff members sit in a school bus to be transported to another school after a shooting at the Santa Fe High School in Santa Fe, Texas, on Friday morning, May 18, 2018. (Jennifer Reynolds/The Galveston County Daily News via AP)
A Santa Fe Police officer consoles others after a shooting at Santa Fe High School in Santa Fe, Texas on Friday, May 18, 2018. (Jennifer Reynolds /The Galveston County Daily News via AP)
Santa Fe High School staff react as they gather in the parking lot of a gas station following a shooting at the school in Santa Fe, Texas, on Friday, May 18, 2018. (Jennifer Reynolds/The Galveston County Daily News via AP)
A Pearland Police armored vehicle stands ready in front of Santa Fe High School in Santa Fe, Texas, in response to a shooting on Friday morning, May 18, 2018. (Kevin M. Cox/The Galveston County Daily News via AP)
Santa Fe High School staff react as they gather in the parking lot of a gas station following a shooting at the school in Santa Fe, Texas, on Friday, May 18, 2018. (Jennifer Reynolds/The Galveston County Daily News via AP)
Emergency responders from multiple agencies work at the scene in front of Santa Fe High School in response to a shooting on Friday, May 18, 2018, in Santa Fe, Texas. (Kevin M. Cox /The Galveston County Daily News via AP)
Santa Fe High School student Dakota Shrader is comforted by her mother Susan Davidson following a shooting at the school on Friday, May 18, 2018, in Santa Fe, Texas. Shrader said her friend was shot in the incident. (Stuart Villanueva/The Galveston County Daily News via AP)
Police officers work a check point in front of Santa Fe High School in response to a shooting at the school on Friday, May 18, 2018, in Santa Fe, Texas. (Kevin M. Cox /The Galveston County Daily News via AP)
A woman reacts while making a phone call outside the Alamo Gym where parents wait to reunite with their children following a shooting at Santa Fe High School in Santa Fe, Texas, on Friday, May 18, 2018. (Michael Ciaglo/Houston Chronicle via AP)
Police officers in tactical gear move through the scene at Santa Fe High School after a shooting on Friday, May 18, 2018, in Santa Fe, Texas. (Kevin M. Cox /The Galveston County Daily News via AP)
Emergency Medical Service personnel walk in front of Santa Fe High School after a shooting on Friday, May 18, 2018, in Santa Fe, Texas. (Kevin M. Cox /The Galveston County Daily News via AP)
A woman prays in the grass outside the Alamo Gym where parents wait to reunite with their kids following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Michael Ciaglo/Houston Chronicle via AP)
People embrace outside the Alamo Gym where students and parents wait to reunite following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. ( Michael Ciaglo/Houston Chronicle via AP)
Santa Fe High School freshman Caitlyn Girouard, center, hugs her friend outside the Alamo Gym where students and parents wait to reunite following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Michael Ciaglo/Houston Chronicle via AP)
Parents of Santa Fe High School students join in prayer at the parking lot of the Arcadia First Baptist Christian School accompanied by residents after a shooter open fired at the high school, Friday, May 18, 2018, in Santa Fe, Texas. (Marie D. De Jesus/Houston Chronicle via AP)
Law enforcement officers respond to an active shooter in front of Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Steve Gonzales/Houston Chronicle via AP)
Law enforcement officers respond to Santa Fe High School after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. ( Steve Gonzales/Houston Chronicle via AP)
A man hugs a woman outside the Alamo Gym where parents wait to reunite with their children following a shooting at Santa Fe High School in Santa Fe, Texas, on Friday, May 18, 2018. (Michael Ciaglo/Houston Chronicle via AP)
A woman prays in the grass outside the Alamo Gym where parents wait to reunite with their kids following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Michael Ciaglo/Houston Chronicle via AP)
Emergency responder vehicles line the street in front of Santa Fe High School following a shooting at the school Friday, May 18, 2018, in Santa Fe, Texas. (Steve Gonzales/Houston Chronicle via AP)
Law enforcement officers respond to Santa Fe High School after an active shooter was reported on campus, Friday, May 18, 2018, in Santa Fe, Texas. ( Steve Gonzales/Houston Chronicle via AP)
Law enforcement officers respond to an active shooter in front of Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Steve Gonzale/Houston Chronicle via AP)
Law enforcement officers respond to an active shooter in front of Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Steve Gonzale/Houston Chronicle via AP)
Law enforcement officers respond to an active shooter in front of Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Steve Gonzale/Houston Chronicle via AP)
A women talks on her phone following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (Michael Ciaglo/Houston Chronicle via AP)
Community members wait on details at the Santa Fe ISD Alamo Gym where students and faculty are being brought after a shooting at Santa Fe High School on Friday, May 18, 2018, in Santa Fe, Texas. (Jennifer Reynolds /The Galveston County Daily News via AP)
A Texas DPS trooper walks to the scene of a shooting at Santa Fe High School on Friday, May 18, 2018, in Santa Fe, Texas. (Stuart Villanueva /The Galveston County Daily News via AP)
A pedestrian waits for ambulances from the shooting at Santa Fe High School at the John Sealy Hospital at the University of Texas Medical Branch in Galveston, Texas, on Friday, May 18, 2018. There were three patients with gunshot wounds admitted to the hospital. (Kelsey Walling /The Galveston County Daily News via AP)
Chief Nursing Officer Dr. David Marshall, left, and Chief Medical and Clinical Officer Dr. Gulshan Sharma give an update on the patients from the Santa Fe High School shooting at the John Sealy Hospital at the University of Texas Medical Branch in Galveston, Texas on Friday, May 18, 2018. (Kelsey Walling /The Galveston County Daily News via AP)
Santa Fe High School senior Logan Roberds talks to reporters outside the Alamo Gym where students and parents wait to reunite following a shooting at Santa Fe High School Friday, May 18, 2018, in Santa Fe, Texas. (AP Photo/David J. Phillip)
She also directed her frustration at Trump, writing "Our children are being MURDERED and you're treating this like a game. This is the 22nd school shooting just this year. DO SOMETHING."
In Texas, senior Logan Roberds said he was near the school's art room when he heard a fire alarm and left the building with other students. Once outside, Roberds said, he heard two loud bangs. He initially thought somebody was loudly hitting a trash can. Then came three more bangs.
"That's when the teachers told us to run," he said.
At that point, Roberds said, he told himself, "Oh my God, this is not fake. This is actually happening."
Friday's assault was the deadliest in Texas since a man with a semi-automatic rifle attacked a rural church late last year, killing more than two dozen people. The Parkland attack killed 17.
Aerial footage showed students standing in a grassy field and three medical helicopters landing at the school.
One student told Houston television station KTRK in a telephone interview that a gunman came into her first-period art class and started shooting. The student said she saw one girl with blood on her leg as the class evacuated the room.
"We thought it was a fire drill at first but really, the teacher said, 'Start running,'" the student told the television station.
The student said she did not get a good look at the shooter because she was running away. She said students escaped through a door at the back of the classroom.
In the aftermath of the assault on Marjory Stoneman Douglas High School, survivors pulled all-nighters, petitioned city councils and state lawmakers, and organized protests in a grass-roots movement.
Within weeks, state lawmakers adopted changes, including new weapons restrictions. The move cemented the gun-friendly state's break with the National Rifle Association. The NRA fought back with a lawsuit.
In late March, the teens spearheaded one of the largest student protest marches since Vietnam in Washington and inspired hundreds of other marches from California to Japan.
The calls for tighter gun controls that have swelled since the February mass shooting at a Florida high school have barely registered in gun-loving Texas โ at least to this point.
Texas has some of the most permissive gun laws in the U.S. and just hosted the NRA's annual conference earlier this month. In the run-up to March primaries, gun control was not a main issue with candidates of either party. Republicans did not soften their views on guns, and Democrats campaigned on a range of issues instead of zeroing in on gun violence.