A suspect was in custody after a high school shooting south of Houston, an assistant principal at Santa Fe High School told CBS affiliate KHOU-TV. The school district said on social media that "there have been confirmed injuries" but didn't provide more details.
Tyler, a senior at the school, told KHOU-TV that his friend saw "some kid" with a gun pull a fire alarm in a school hallway and then run outside. When teachers and students were outside, shots were fired.
"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, 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.
This is a developing story and will be updated.