Explosive devices found at Texas high school after fatal shooting

Several people were killed in a shooting at Santa Fe High School in Santa Fe, Texas, about 30 miles from Houston, Friday, May 18, 2018. (Harris County Sheriff‘s Office/Twitter)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)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)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)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)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 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)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)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)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)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)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)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)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)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)

SANTA FE, Texas — At least one gunman opened fire at a Houston-area high school Friday, killing eight to 10 people, most of them students, authorities said.

Harris County Sheriff Ed Gonzalez said he could not be precise about the number of deaths at Santa Fe High School, which went on lockdown around 8 a.m. One person was in custody, and a second person had been detained, he said.

An unknown number of possible explosive devices were found at the school and off campus. Authorities were in the process of rendering them safe and asked the public to call 911 if they see anything suspicious.

It was the nation’s deadliest school shooting since the February attack in Parkland, Florida, that killed 17 people and re-energized the gun-control movement after surviving teens launched a campaign for reform.

The district confirmed an unspecified number of injuries but said it would not immediately release further details. A school police officer was shot, officials said, but there was no immediate word on his condition.

“We hope the worst is over, and I really can’t say any more about that because it would be pure speculation,” Assistant Principal Cris Richardson told reporters at the scene.

Aerial footage showed students standing in a grassy field and three medical helicopters landing at the school in Santa Fe, a city of about 13,000 people roughly 30 miles (48 kilometers) southeast of Houston.

School officials said law enforcement officers were working to secure the building and move students to another location. Students were being transported to another location to reunite with their parents.

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.

Authorities did not immediately confirm that report.

The shooting was all but certain to re-ignite the national debate over gun regulations. In the aftermath of the Feb. 14 attack 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.

Associated Press writers David Warren, Jamie Stengle, Nomaan Merchant and Diana Heidgerd in Dallas, and Will Weissert and Paul Weber in Austin, Texas, contributed to this report.