The high school student accused of opening fire at a Texas high school and killing 10 people on Friday has been charged with capital murder, the Galveston County Sheriff's Office said.

The sheriff's office said in a statement posted on Facebook that 17-year-old Dimitrios Pagourtzis is being held in Galveston County Jail, and that additional charges could still be filed.

"The suspect from the Santa Fe [Independent School District] shooting scene has been booked into the Galveston County Jail," the sheriff's office said. "He is identified as Dimitrios Pagourtzis, W/M, 17 years of age. He is being held on Capital Murder with no bond. Additional charges may follow."

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Authorities allege that Pagourtzis opened fire at Santa Fe High School, near Houston, killing nine students and one teacher and injuring another 10 people. He was taken into custody shortly after the shooting. Another student at the school has been detained as a person of interest.

Texas Gov. Greg Abbott said at a news conference on Friday that Pagourtzis used a shotgun and a .38 revolver that belonged to his father to carry out the attack. He also said that a third person believed to have "certain information" will be interviewed by law enforcement.

The Santa Fe school district also said in a tweet that authorities had located explosive devices both at the high school and off campus. No explosions have been confirmed.