Nine students and one teacher were killed at a Texas high school on Friday when a gunman entered the school armed with two guns and improvised explosives.

Dimitrios Pagourtzis, a 17-year-old student at Santa Fe High School, has been charged with capital murder following the incident, the Galveston County Sheriff's Office said. He is being held without bond and made his first court appearance on Friday evening.

At least two other people of interest have been detained in the investigation into the attack in Santa Fe, not far outside Houston.

The attacker allegedly used a .38 revolver and a shotgun acquired from his father in the shooting, which sent 10 others to area hospitals with mostly gunshot wounds, according to police.

A search of Pagourtzis's home and a vehicle nearby conducted by police reportedly turned up further devices, including a molotov cocktail.

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Texas Gov. Greg Abbott (R), speaking at a press conference, said that the suspect turned himself over to police after originally planning to commit suicide during the attack.

The attack, the governor said, was “one of the most heinous attacks that we’ve ever seen in the history of Texas schools.”

In a separate statement, the governor offered "prayers of comfort" to the victims' families and ordered state flags to be flown at half-staff.

Texas Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R) also released a statement following the shooting, thanking first responders for their efforts to save lives.

"Heidi and I are keeping all the students and faculty at Santa Fe High School in our prayers this morning, along with all first responders on the scene. Please be safe and heed warnings from local officials," he said.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE commented on the shooting during an event at the White House on Friday shortly after it occurred, calling it "absolutely horrific."

“This has been going on too long in our country, too many years, too many decades now,” Trump said.

“My administration is determined to do everything in our power to protect our students, secure our schools and to keep weapons out of the hands of those who pose a threat to themselves and to others,” he added.

Education Secretary Betsy DeVos Elizabeth (Betsy) Dee DeVosSpecial counsel investigating DeVos for potential Hatch Act violation: report NEA president says Azar and DeVos should resign over school reopening guidance The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now MORE praised the president's efforts on school safety after the attack, urging Americans to support bipartisan propositions for making schools safer.

The Federal Commission on School Safety is “working to identify proven ways to prevent violence and keep our students safe at school,” DeVos said Friday.

The shooting prompted frustrated reactions from student activists from Parkland, Fla., which suffered a deadly school shooting in February.

David Hogg, one of the Marjory Stoneman Douglas High School students behind the "March For Our Lives" movement against gun violence, tweeted his low expectations for how lawmakers would respond to the shooting and fellow Stoneman Douglas survivor Cameron Kasky said no real action would follow Trump's call for solutions.

Get ready for two weeks of media coverage of politicians acting like they give a shit when in reality they just want to boost their approval ratings before midterms. — David Hogg (@davidhogg111) May 18, 2018

Donald Trump does not care about school shootings.



Donald Trump does nothing to stop school shootings.



Don’t talk to me about the ‘stop school violence act,’ because that does nothing to stop school shootings.



Donald Trump does not care about you or your kids getting shot. — Cameron Kasky (@cameron_kasky) May 18, 2018

One Santa Fe High School student, identified by local media only as "Paige," told reporters that she and many others feared that such a shooting could take place at their school after the Parkland shooting.

"It's been happening everywhere,” Paige told a local news station. "I've always kind of felt eventually it would happen here, too."

— Updated: 7:29 p.m.