SANTA FE, Texas - A sheriff says the 17-year-old suspect in the fatal shooting of at least 10 people at his Houston-area high school is being held on a capital murder charge.

Galveston County Sheriff Henry Trochesset says in a statement that the student, Dimitrios Pagourtzis, is being held without bond in the Galveston County jail. Pagourtzis was arraigned late Friday afternoon.

The shooting happened early Friday morning at Santa Fe High School in Santa Fe, Texas, a town of about 12,000 people in Galveston County, 36 miles south of Houston.

Abbott confirmed that there were two weapons used in the deadly shooting, a shotgun and a .38 revolver.

Pressure cookers and pipe bombs were found at the high school, according to a tweet from school officials with the Santa Fe ISD.

The school district's superintendent, Dr. Leigh Wall, issued this statement via Twitter:

The school district posted to social media moments after the shooting that "there have been confirmed injuries" but didn't immediately provide more details. The first call to emergency first-responders was made at 7:32 a.m., authorities said.

Tyler, a senior at the school, told KHOU-TV that his friend saw "some kid" with a gun. A fire alarm was pulled. When teachers and students were outside, shots were fired, Tyler said.

"As soon as the alarms went off, everybody just started running outside," 10th grader Dakota Shrader told reporters, "and next thing you know everybody looks, and you hear boom, boom, boom, and I just ran as fast as I could to the nearest floor so I could hide, and I called my mom."

Tyler said he ran behind some trees, heard more shots, jumped a fence and ran to a car wash. He said he saw firefighters treat a girl who had a bandage around her knee and may have been shot.

Galveston County sheriff's Maj. Douglas Hudson said units responded to reports of shots fired. He had no immediate details on whether anyone has been hurt.

According to a law enforcement official, the FBI is responding to offer assistance, CBS News senior investigative producer Pat Milton reports.

The federal Bureau of Alcohol, Tobacco, Firearms and Explosives said on social media that it was also responding to the scene.

A mother said that a police officer told her that the shooting happened in an art classroom, CBS affiliate KHOU-TV reports.

A parent told KHOU-TV that some students were evacuated to an auto shop near the campus.    

Santa Fe is a city of about 13,000 residents, located 30 miles southeast of Houston.