A teenage boy has shot a teacher at a high school in Texas, before turning the gun on himself.

The shooting happened at Hill Country College Preparatory High School in Bulverde, a small town around 25 miles (39km) north of San Antonio city centre.

Comal County Sheriff's Office issued a statement on social media: "A teacher was shot by a student and has been taken to a San Antonio hospital. At this time, we do not have an update on her condition.

"The student involved, a 15-year-old male, died at the scene."

A spokesperson for the sheriff's office told the AP news agency the student died from a self-inflicted gunshot.

The school was placed on lockdown, and students were taken to a middle school to be reunited with parents, the sheriff's office added.

The school said its lockdown alarm was activated at 8.34am.

In a post on X, it said: "Students and staff are following the necessary procedures. Local law enforcement is responding."

In a subsequent update, the school said the campus was secure and "the threat has been contained".

Authorities have not said what may have led to the shooting.

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The school, which is part of the Comal Independent School District, describes itself online as having a "strong focus on academics and college readiness skills".

It teaches students from the ninth through to 12th grade, children aged between 14 and 18.

The local sheriff's office later posted a message to parents via Facebook: "We understand how scary this has been for families and our entire community. Thank you for your patience."